<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:37715e0a-412e-41c6-b98f-74bc38f69afc,g:3c391596-b831-4123-afb4-a2a146cadf42-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.digi.com/role/CoverPage" xlink:type="simple" xlink:href="dgii-20240331.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_b7fe540e-8bb2-4f44-bfb6-828c1e237c28" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntitiesTable_b7fe540e-8bb2-4f44-bfb6-828c1e237c28" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsExchangeAxis_bf9040cc-2096-48ea-aca1-d24375539835" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityListingsExchangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_b7fe540e-8bb2-4f44-bfb6-828c1e237c28" xlink:to="loc_dei_EntityListingsExchangeAxis_bf9040cc-2096-48ea-aca1-d24375539835" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_bf9040cc-2096-48ea-aca1-d24375539835_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityListingsExchangeAxis_bf9040cc-2096-48ea-aca1-d24375539835" xlink:to="loc_dei_ExchangeDomain_bf9040cc-2096-48ea-aca1-d24375539835_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_6791829d-328f-4f6b-bce8-4f4682b1b857" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityListingsExchangeAxis_bf9040cc-2096-48ea-aca1-d24375539835" xlink:to="loc_dei_ExchangeDomain_6791829d-328f-4f6b-bce8-4f4682b1b857" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_exch_XNAS_d2f11bef-ed8b-4e6d-9ae9-d74cdd86ef3b" xlink:href="https://xbrl.sec.gov/exch/2023/exch-2023.xsd#exch_XNAS"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_ExchangeDomain_6791829d-328f-4f6b-bce8-4f4682b1b857" xlink:to="loc_exch_XNAS_d2f11bef-ed8b-4e6d-9ae9-d74cdd86ef3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_cefd80b3-1802-4206-b100-40ea8513961d" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_DocumentType_cefd80b3-1802-4206-b100-40ea8513961d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_41ebf1c2-ef53-4ca5-913e-f8b00e7a7399" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_DocumentQuarterlyReport_41ebf1c2-ef53-4ca5-913e-f8b00e7a7399" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_8328e90c-249b-42d8-ba77-9b5baef00a5c" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_DocumentPeriodEndDate_8328e90c-249b-42d8-ba77-9b5baef00a5c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_490c01d3-1447-4804-b3ee-ccfe36e1a55f" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_DocumentTransitionReport_490c01d3-1447-4804-b3ee-ccfe36e1a55f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_4b8f8afd-9ff8-4b6e-9669-afebf0f888a3" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityFileNumber_4b8f8afd-9ff8-4b6e-9669-afebf0f888a3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_27384c04-9386-449b-bdeb-e79b1e6b5208" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityRegistrantName_27384c04-9386-449b-bdeb-e79b1e6b5208" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_d0318ccb-6756-4f39-8fd4-d5a9aee0e677" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityIncorporationStateCountryCode_d0318ccb-6756-4f39-8fd4-d5a9aee0e677" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_5c983c85-b5dc-4f81-802c-269eb1251e6b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityTaxIdentificationNumber_5c983c85-b5dc-4f81-802c-269eb1251e6b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_be0bec98-f3d2-4000-a387-d8c0fcbadb63" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityAddressAddressLine1_be0bec98-f3d2-4000-a387-d8c0fcbadb63" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_6b1bb17b-794e-4b5d-9ae0-cca24c1010d3" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityAddressAddressLine2_6b1bb17b-794e-4b5d-9ae0-cca24c1010d3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_811019d6-0bd1-4c25-8c8a-44c0456a9571" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityAddressCityOrTown_811019d6-0bd1-4c25-8c8a-44c0456a9571" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_442286a3-523b-4917-ba02-426712698b92" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityAddressStateOrProvince_442286a3-523b-4917-ba02-426712698b92" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_61610b8d-cdf7-4315-abd8-159f3e864b2f" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityAddressPostalZipCode_61610b8d-cdf7-4315-abd8-159f3e864b2f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_1baddb52-cf09-49c9-a1a0-9514f0cde265" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_CityAreaCode_1baddb52-cf09-49c9-a1a0-9514f0cde265" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_38212121-e059-4721-8292-2c975c0e44ca" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_LocalPhoneNumber_38212121-e059-4721-8292-2c975c0e44ca" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_b8c1c7c7-c0bd-405a-bfdd-8f4b3362f800" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_Security12bTitle_b8c1c7c7-c0bd-405a-bfdd-8f4b3362f800" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_f0281036-524e-45ee-9ca5-0bb271295b9c" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_TradingSymbol_f0281036-524e-45ee-9ca5-0bb271295b9c" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_02143b40-e1a1-4ebf-8aff-bb4017480120" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_SecurityExchangeName_02143b40-e1a1-4ebf-8aff-bb4017480120" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_32630edf-71ff-405c-8c38-af892b70e33e" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityCurrentReportingStatus_32630edf-71ff-405c-8c38-af892b70e33e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_b41908ce-5ee0-45a5-a4e5-1803c983e29a" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityInteractiveDataCurrent_b41908ce-5ee0-45a5-a4e5-1803c983e29a" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_9f403662-b2bf-480f-a0f5-567592d1ba60" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityFilerCategory_9f403662-b2bf-480f-a0f5-567592d1ba60" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_5e8bef5b-02ad-4e72-b5b4-18e1c7977386" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntitySmallBusiness_5e8bef5b-02ad-4e72-b5b4-18e1c7977386" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_c0ff9838-48fa-4c35-8a29-33d1af3ff1a3" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityEmergingGrowthCompany_c0ff9838-48fa-4c35-8a29-33d1af3ff1a3" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_502d9c2d-5362-48c1-a93a-a4313f62dbc5" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityShellCompany_502d9c2d-5362-48c1-a93a-a4313f62dbc5" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_b5566ee3-aef8-45fa-938c-b586f3dca50b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_b5566ee3-aef8-45fa-938c-b586f3dca50b" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_c803b421-e937-4263-9aaf-57ad54c0d805" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_EntityCentralIndexKey_c803b421-e937-4263-9aaf-57ad54c0d805" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_509d063c-c244-4afa-b487-0cd74c74a22d" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_CurrentFiscalYearEndDate_509d063c-c244-4afa-b487-0cd74c74a22d" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_713f78b9-1fe1-4292-aeb5-21d21406f0fa" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_DocumentFiscalYearFocus_713f78b9-1fe1-4292-aeb5-21d21406f0fa" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_8343b81a-5e2d-4b65-9298-216170306198" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_DocumentFiscalPeriodFocus_8343b81a-5e2d-4b65-9298-216170306198" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_c6972c2a-6287-4790-931f-d7979ad1ae85" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_19e776b1-bcf0-47d0-8552-777c23cab4cf" xlink:to="loc_dei_AmendmentFlag_c6972c2a-6287-4790-931f-d7979ad1ae85" xlink:type="arc" order="29"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/CondensedConsolidatedStatementsofOperationsUnaudited" xlink:type="simple" xlink:href="dgii-20240331.xsd#CondensedConsolidatedStatementsofOperationsUnaudited"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/CondensedConsolidatedStatementsofOperationsUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_a1328990-6d08-4c05-a17e-398424e27805" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_StatementTable_a1328990-6d08-4c05-a17e-398424e27805" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_e278fd95-1831-41cf-96c4-41b61c2af257" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_a1328990-6d08-4c05-a17e-398424e27805" xlink:to="loc_srt_ProductOrServiceAxis_e278fd95-1831-41cf-96c4-41b61c2af257" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e278fd95-1831-41cf-96c4-41b61c2af257_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_e278fd95-1831-41cf-96c4-41b61c2af257" xlink:to="loc_srt_ProductsAndServicesDomain_e278fd95-1831-41cf-96c4-41b61c2af257_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_512d77ad-ff1c-4fc2-8fd4-45ecef7ed74e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_e278fd95-1831-41cf-96c4-41b61c2af257" xlink:to="loc_srt_ProductsAndServicesDomain_512d77ad-ff1c-4fc2-8fd4-45ecef7ed74e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_6ed03ca0-4476-43a8-ba56-27b4c8f3438a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_512d77ad-ff1c-4fc2-8fd4-45ecef7ed74e" xlink:to="loc_us-gaap_ProductMember_6ed03ca0-4476-43a8-ba56-27b4c8f3438a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_aaeecd64-f2ff-4921-acf0-a6ffcfbc4be3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_512d77ad-ff1c-4fc2-8fd4-45ecef7ed74e" xlink:to="loc_us-gaap_ServiceMember_aaeecd64-f2ff-4921-acf0-a6ffcfbc4be3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_f0217412-c48e-46b7-b0e5-aca72df7e56b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_RevenuesAbstract_f0217412-c48e-46b7-b0e5-aca72df7e56b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_cc2a9636-3f9a-4ff7-a8ea-20305694277d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_f0217412-c48e-46b7-b0e5-aca72df7e56b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_cc2a9636-3f9a-4ff7-a8ea-20305694277d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_053f94ae-688a-4fe1-80aa-de9028da54a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_f0217412-c48e-46b7-b0e5-aca72df7e56b" xlink:to="loc_us-gaap_Revenues_053f94ae-688a-4fe1-80aa-de9028da54a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_fae47ffb-aa9a-4af2-9618-e3d579ce9c64" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfGoodsAndServicesSoldAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_fae47ffb-aa9a-4af2-9618-e3d579ce9c64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_CostOfGoodsAndServicesSoldExcludingAmortization_d459dd9b-a9d3-4a0e-b8a5-2474305a2275" xlink:href="dgii-20240331.xsd#dgii_CostOfGoodsAndServicesSoldExcludingAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_fae47ffb-aa9a-4af2-9618-e3d579ce9c64" xlink:to="loc_dgii_CostOfGoodsAndServicesSoldExcludingAmortization_d459dd9b-a9d3-4a0e-b8a5-2474305a2275" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldAmortization_148c8f9f-2fd2-456d-869f-75cac292e259" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfGoodsAndServicesSoldAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_fae47ffb-aa9a-4af2-9618-e3d579ce9c64" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldAmortization_148c8f9f-2fd2-456d-869f-75cac292e259" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_f15e97b0-0161-4e90-ae89-200cc9bac077" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_fae47ffb-aa9a-4af2-9618-e3d579ce9c64" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_f15e97b0-0161-4e90-ae89-200cc9bac077" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_2c21d452-0a8f-4914-8dd7-5516fa6769b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_GrossProfit_2c21d452-0a8f-4914-8dd7-5516fa6769b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_6d9e52f2-50e8-4ff5-aafe-5486fec4f57f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_OperatingExpensesAbstract_6d9e52f2-50e8-4ff5-aafe-5486fec4f57f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_328cedfb-459b-4ea3-b7b9-a72104427c7b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_6d9e52f2-50e8-4ff5-aafe-5486fec4f57f" xlink:to="loc_us-gaap_SellingAndMarketingExpense_328cedfb-459b-4ea3-b7b9-a72104427c7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost_ed41d986-577d-4cb5-9552-587acf28e0b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_6d9e52f2-50e8-4ff5-aafe-5486fec4f57f" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost_ed41d986-577d-4cb5-9552-587acf28e0b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_de6b151a-49b0-4d44-9384-83d491f48c63" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_6d9e52f2-50e8-4ff5-aafe-5486fec4f57f" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_de6b151a-49b0-4d44-9384-83d491f48c63" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_7554965c-965c-4228-9851-37d0f6ebbeae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_6d9e52f2-50e8-4ff5-aafe-5486fec4f57f" xlink:to="loc_us-gaap_OperatingExpenses_7554965c-965c-4228-9851-37d0f6ebbeae" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_9eb08433-a473-43c8-807e-48e93245b686" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_OperatingIncomeLoss_9eb08433-a473-43c8-807e-48e93245b686" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_e0d30dc7-0c0b-4668-9859-3f30d6de8688" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_e0d30dc7-0c0b-4668-9859-3f30d6de8688" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_bd0b338c-b3ce-46eb-b459-7a55a8220e4e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_e0d30dc7-0c0b-4668-9859-3f30d6de8688" xlink:to="loc_us-gaap_InterestExpense_bd0b338c-b3ce-46eb-b459-7a55a8220e4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_3763a93c-0f1d-4536-9e42-bdd6b8e1077d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_e0d30dc7-0c0b-4668-9859-3f30d6de8688" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_3763a93c-0f1d-4536-9e42-bdd6b8e1077d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_b30f8b21-a46d-439f-886e-79f9d1811967" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_e0d30dc7-0c0b-4668-9859-3f30d6de8688" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_b30f8b21-a46d-439f-886e-79f9d1811967" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_OtherIncomeNet_63b4f808-4726-4b91-9583-0cd2350fc73a" xlink:href="dgii-20240331.xsd#dgii_OtherIncomeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_e0d30dc7-0c0b-4668-9859-3f30d6de8688" xlink:to="loc_dgii_OtherIncomeNet_63b4f808-4726-4b91-9583-0cd2350fc73a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_3977a1b3-4cc0-4a41-bfdd-cd10e507ca0e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_3977a1b3-4cc0-4a41-bfdd-cd10e507ca0e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_5f411f66-5013-45a4-ae92-cd4b67829147" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_5f411f66-5013-45a4-ae92-cd4b67829147" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_07c24102-ba4a-4a6c-9172-6e5e8ae34777" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_NetIncomeLoss_07c24102-ba4a-4a6c-9172-6e5e8ae34777" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_4b7c538e-9bd8-4b3d-ac0a-4e4a45585a96" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_4b7c538e-9bd8-4b3d-ac0a-4e4a45585a96" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_461e8dff-0c08-4661-8362-56e152801750" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_4b7c538e-9bd8-4b3d-ac0a-4e4a45585a96" xlink:to="loc_us-gaap_EarningsPerShareBasic_461e8dff-0c08-4661-8362-56e152801750" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_460d0ed5-c3c0-4bdc-b38b-f875d96b1031" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareDilutedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_460d0ed5-c3c0-4bdc-b38b-f875d96b1031" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_5ca74b73-193f-45cf-99f8-5486e46bb72f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_460d0ed5-c3c0-4bdc-b38b-f875d96b1031" xlink:to="loc_us-gaap_EarningsPerShareDiluted_5ca74b73-193f-45cf-99f8-5486e46bb72f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_30ca2299-a165-41f9-8f84-5e8ad0c2ef8e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ca78ebc5-5b7e-49ad-ab7b-c223e98da35a" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_30ca2299-a165-41f9-8f84-5e8ad0c2ef8e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_07c382d8-8955-4383-8ed5-dcc8cf4994cb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_30ca2299-a165-41f9-8f84-5e8ad0c2ef8e" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_07c382d8-8955-4383-8ed5-dcc8cf4994cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_8b60fe82-ffc7-423b-9a32-a6a37818a727" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_30ca2299-a165-41f9-8f84-5e8ad0c2ef8e" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_8b60fe82-ffc7-423b-9a32-a6a37818a727" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/CondensedConsolidatedStatementsofStockholdersEquityUnaudited" xlink:type="simple" xlink:href="dgii-20240331.xsd#CondensedConsolidatedStatementsofStockholdersEquityUnaudited"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/CondensedConsolidatedStatementsofStockholdersEquityUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_e41818c0-f171-4923-a1cc-075732edbb9d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_68f764c0-a41a-44c3-9fa6-88975c687684" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_e41818c0-f171-4923-a1cc-075732edbb9d" xlink:to="loc_us-gaap_StatementTable_68f764c0-a41a-44c3-9fa6-88975c687684" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_0c8e2ddd-3ee6-44c2-a900-fa83781236c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_68f764c0-a41a-44c3-9fa6-88975c687684" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_0c8e2ddd-3ee6-44c2-a900-fa83781236c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_0c8e2ddd-3ee6-44c2-a900-fa83781236c8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_0c8e2ddd-3ee6-44c2-a900-fa83781236c8" xlink:to="loc_us-gaap_EquityComponentDomain_0c8e2ddd-3ee6-44c2-a900-fa83781236c8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ebdf150b-5be9-400f-a4c7-94382b432f71" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_0c8e2ddd-3ee6-44c2-a900-fa83781236c8" xlink:to="loc_us-gaap_EquityComponentDomain_ebdf150b-5be9-400f-a4c7-94382b432f71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_d79355ec-7f39-4c6b-9641-386a934c036a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ebdf150b-5be9-400f-a4c7-94382b432f71" xlink:to="loc_us-gaap_CommonStockMember_d79355ec-7f39-4c6b-9641-386a934c036a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_f8019bfd-7c3c-449a-bd57-5bb871d5975d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ebdf150b-5be9-400f-a4c7-94382b432f71" xlink:to="loc_us-gaap_TreasuryStockCommonMember_f8019bfd-7c3c-449a-bd57-5bb871d5975d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_25f0be1b-2557-438b-aa82-7d05d23b4122" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ebdf150b-5be9-400f-a4c7-94382b432f71" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_25f0be1b-2557-438b-aa82-7d05d23b4122" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_63226905-4acc-4551-8084-0ac1c819c563" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ebdf150b-5be9-400f-a4c7-94382b432f71" xlink:to="loc_us-gaap_RetainedEarningsMember_63226905-4acc-4551-8084-0ac1c819c563" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f510d6a5-fcee-4622-a81b-d89f6117ba0c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ebdf150b-5be9-400f-a4c7-94382b432f71" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f510d6a5-fcee-4622-a81b-d89f6117ba0c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_213f2a1e-fab7-43ae-a8f1-e136ec5a4045" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_68f764c0-a41a-44c3-9fa6-88975c687684" xlink:to="loc_srt_RestatementAxis_213f2a1e-fab7-43ae-a8f1-e136ec5a4045" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_213f2a1e-fab7-43ae-a8f1-e136ec5a4045_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_213f2a1e-fab7-43ae-a8f1-e136ec5a4045" xlink:to="loc_srt_RestatementDomain_213f2a1e-fab7-43ae-a8f1-e136ec5a4045_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_8c43bea7-eb09-4e58-91e8-200ed12d97b7" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_213f2a1e-fab7-43ae-a8f1-e136ec5a4045" xlink:to="loc_srt_RestatementDomain_8c43bea7-eb09-4e58-91e8-200ed12d97b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e41818c0-f171-4923-a1cc-075732edbb9d" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_70faa45c-4113-4d4e-a61f-3f476b23a8d2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:to="loc_us-gaap_SharesIssued_70faa45c-4113-4d4e-a61f-3f476b23a8d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_bd9ef55e-c30d-4758-83ee-41bd0ed42e07" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:to="loc_us-gaap_StockholdersEquity_bd9ef55e-c30d-4758-83ee-41bd0ed42e07" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_c94f5309-b481-4830-9c70-94d77aa7ebd5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:to="loc_us-gaap_NetIncomeLoss_c94f5309-b481-4830-9c70-94d77aa7ebd5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_a6a0d3d3-58c2-4f3b-bccc-51bf0123b312" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_a6a0d3d3-58c2-4f3b-bccc-51bf0123b312" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_90c861ec-538f-451d-94d8-eed4d0b11c81" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_90c861ec-538f-451d-94d8-eed4d0b11c81" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_1f92619b-72bb-4aea-ab41-71b621167ed6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_1f92619b-72bb-4aea-ab41-71b621167ed6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_eba8ea44-2384-4cff-aee7-a4fcf940a176" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_eba8ea44-2384-4cff-aee7-a4fcf940a176" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_57919448-e2a8-413e-a9f3-ead1d7fae080" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_57919448-e2a8-413e-a9f3-ead1d7fae080" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_526422e1-7097-4144-8986-c837b62184a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_526422e1-7097-4144-8986-c837b62184a3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_5fe657cf-7964-48a4-b36a-02f3e8d02da5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_5fe657cf-7964-48a4-b36a-02f3e8d02da5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_82d90b15-7d1c-42cf-9740-48f49ae4d708" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8a66eb9-b63a-45e6-9c64-df5b39f11cdb" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_82d90b15-7d1c-42cf-9740-48f49ae4d708" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_ee5cd967-f599-46de-a374-2a78a5b290d0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_6468a37d-7723-42c3-8064-4ec31fb6a1c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/GoodwillandOtherIdentifiableIntangibleAssetsNetDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#GoodwillandOtherIdentifiableIntangibleAssetsNetDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/GoodwillandOtherIdentifiableIntangibleAssetsNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2c789949-a951-42a9-8a94-1b7d3101a7d5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_70234c20-9d82-49ab-bf8c-9f488b2d9819" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2c789949-a951-42a9-8a94-1b7d3101a7d5" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_70234c20-9d82-49ab-bf8c-9f488b2d9819" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_fd04cd2f-8dc8-4db1-812c-288b04a0632d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_70234c20-9d82-49ab-bf8c-9f488b2d9819" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_fd04cd2f-8dc8-4db1-812c-288b04a0632d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_fd04cd2f-8dc8-4db1-812c-288b04a0632d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_fd04cd2f-8dc8-4db1-812c-288b04a0632d" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_fd04cd2f-8dc8-4db1-812c-288b04a0632d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c9a122a2-0c8b-442a-97ea-56ab2bdb4274" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_fd04cd2f-8dc8-4db1-812c-288b04a0632d" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c9a122a2-0c8b-442a-97ea-56ab2bdb4274" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_CostofSalesandGeneralandAdministrativeExpenseMember_2afb233b-21a7-47ae-8260-9974504bfaaa" xlink:href="dgii-20240331.xsd#dgii_CostofSalesandGeneralandAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c9a122a2-0c8b-442a-97ea-56ab2bdb4274" xlink:to="loc_dgii_CostofSalesandGeneralandAdministrativeExpenseMember_2afb233b-21a7-47ae-8260-9974504bfaaa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4c8a375b-1f8a-41f2-a0e0-3af16acb8c4f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_70234c20-9d82-49ab-bf8c-9f488b2d9819" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4c8a375b-1f8a-41f2-a0e0-3af16acb8c4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_4c8a375b-1f8a-41f2-a0e0-3af16acb8c4f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4c8a375b-1f8a-41f2-a0e0-3af16acb8c4f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_4c8a375b-1f8a-41f2-a0e0-3af16acb8c4f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7941874a-10c9-4eb4-b647-e6944c3d7f40" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4c8a375b-1f8a-41f2-a0e0-3af16acb8c4f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7941874a-10c9-4eb4-b647-e6944c3d7f40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_27d873b9-9572-436f-92fd-79b38b9c6f20" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7941874a-10c9-4eb4-b647-e6944c3d7f40" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_27d873b9-9572-436f-92fd-79b38b9c6f20" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicensingAgreementsMember_1c979954-50d3-416c-b996-64a5544e2ec3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LicensingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7941874a-10c9-4eb4-b647-e6944c3d7f40" xlink:to="loc_us-gaap_LicensingAgreementsMember_1c979954-50d3-416c-b996-64a5544e2ec3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntellectualPropertyMember_3afc4300-1b6c-4031-a435-eefbb8535c47" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntellectualPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7941874a-10c9-4eb4-b647-e6944c3d7f40" xlink:to="loc_us-gaap_IntellectualPropertyMember_3afc4300-1b6c-4031-a435-eefbb8535c47" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_06764397-2956-4cf2-9b0c-656e4d76bab7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7941874a-10c9-4eb4-b647-e6944c3d7f40" xlink:to="loc_us-gaap_CustomerRelationshipsMember_06764397-2956-4cf2-9b0c-656e4d76bab7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_877f140b-6372-41ba-a63a-ab7859eeab25" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncompeteAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7941874a-10c9-4eb4-b647-e6944c3d7f40" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_877f140b-6372-41ba-a63a-ab7859eeab25" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrderOrProductionBacklogMember_926e7441-5e85-423e-8aa2-9bd4d27d48c9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OrderOrProductionBacklogMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7941874a-10c9-4eb4-b647-e6944c3d7f40" xlink:to="loc_us-gaap_OrderOrProductionBacklogMember_926e7441-5e85-423e-8aa2-9bd4d27d48c9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_688af8a8-e48d-4d24-8183-07166e84cc0d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2c789949-a951-42a9-8a94-1b7d3101a7d5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_688af8a8-e48d-4d24-8183-07166e84cc0d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_bb1c73fa-5d58-40ba-a701-38e8c7ead569" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2c789949-a951-42a9-8a94-1b7d3101a7d5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_bb1c73fa-5d58-40ba-a701-38e8c7ead569" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_ece0a249-b43b-430b-8ee7-4b2c31fd2621" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2c789949-a951-42a9-8a94-1b7d3101a7d5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_ece0a249-b43b-430b-8ee7-4b2c31fd2621" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_801fdc17-5c64-4d95-81c3-0dd9bd729ab7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2c789949-a951-42a9-8a94-1b7d3101a7d5" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_801fdc17-5c64-4d95-81c3-0dd9bd729ab7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_9da13345-f4b7-4058-8b31-72644fa758b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2c789949-a951-42a9-8a94-1b7d3101a7d5" xlink:to="loc_us-gaap_Goodwill_9da13345-f4b7-4058-8b31-72644fa758b8" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/GoodwillandOtherIdentifiableIntangibleAssetsNetAdditionalInformationDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#GoodwillandOtherIdentifiableIntangibleAssetsNetAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/GoodwillandOtherIdentifiableIntangibleAssetsNetAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_141c0149-ab86-43cb-99da-a5f24499b9e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_7a665a2b-06bc-40be-b2dd-2b446fa9eba0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_141c0149-ab86-43cb-99da-a5f24499b9e5" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_7a665a2b-06bc-40be-b2dd-2b446fa9eba0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_ba312442-d395-4a31-bc2c-78faec1531ca" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_7a665a2b-06bc-40be-b2dd-2b446fa9eba0" xlink:to="loc_srt_RangeAxis_ba312442-d395-4a31-bc2c-78faec1531ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ba312442-d395-4a31-bc2c-78faec1531ca_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_ba312442-d395-4a31-bc2c-78faec1531ca" xlink:to="loc_srt_RangeMember_ba312442-d395-4a31-bc2c-78faec1531ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_556c5fb4-1c42-4651-a4ef-efae4ee2a70d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_ba312442-d395-4a31-bc2c-78faec1531ca" xlink:to="loc_srt_RangeMember_556c5fb4-1c42-4651-a4ef-efae4ee2a70d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_a8420ee5-7310-423d-9ebd-56560ab04b0b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_556c5fb4-1c42-4651-a4ef-efae4ee2a70d" xlink:to="loc_srt_MinimumMember_a8420ee5-7310-423d-9ebd-56560ab04b0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_1504f7da-1e1a-4b36-bacc-b77dfc4920fd" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_556c5fb4-1c42-4651-a4ef-efae4ee2a70d" xlink:to="loc_srt_MaximumMember_1504f7da-1e1a-4b36-bacc-b77dfc4920fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_99fe07bf-844d-4e9f-976a-7c7b785117a9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_7a665a2b-06bc-40be-b2dd-2b446fa9eba0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_99fe07bf-844d-4e9f-976a-7c7b785117a9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_99fe07bf-844d-4e9f-976a-7c7b785117a9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_99fe07bf-844d-4e9f-976a-7c7b785117a9" xlink:to="loc_us-gaap_SegmentDomain_99fe07bf-844d-4e9f-976a-7c7b785117a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_92f72253-3a24-499e-8c27-5b524b9b1fad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_99fe07bf-844d-4e9f-976a-7c7b785117a9" xlink:to="loc_us-gaap_SegmentDomain_92f72253-3a24-499e-8c27-5b524b9b1fad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_IoTProductsandServicesMember_4dad75d2-803f-4ceb-a627-66925c7ac95b" xlink:href="dgii-20240331.xsd#dgii_IoTProductsandServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_92f72253-3a24-499e-8c27-5b524b9b1fad" xlink:to="loc_dgii_IoTProductsandServicesMember_4dad75d2-803f-4ceb-a627-66925c7ac95b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_IoTSolutionsMember_099bd1fa-57e6-4eba-9174-896cb48e919d" xlink:href="dgii-20240331.xsd#dgii_IoTSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_92f72253-3a24-499e-8c27-5b524b9b1fad" xlink:to="loc_dgii_IoTSolutionsMember_099bd1fa-57e6-4eba-9174-896cb48e919d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitAxis_1b4c43d3-8cdb-4c0c-a13f-2f3745b282a4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReportingUnitAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_7a665a2b-06bc-40be-b2dd-2b446fa9eba0" xlink:to="loc_us-gaap_ReportingUnitAxis_1b4c43d3-8cdb-4c0c-a13f-2f3745b282a4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitDomain_1b4c43d3-8cdb-4c0c-a13f-2f3745b282a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReportingUnitDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReportingUnitAxis_1b4c43d3-8cdb-4c0c-a13f-2f3745b282a4" xlink:to="loc_us-gaap_ReportingUnitDomain_1b4c43d3-8cdb-4c0c-a13f-2f3745b282a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitDomain_4cfebccd-7c73-4f77-81d9-07b3a42074ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReportingUnitDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReportingUnitAxis_1b4c43d3-8cdb-4c0c-a13f-2f3745b282a4" xlink:to="loc_us-gaap_ReportingUnitDomain_4cfebccd-7c73-4f77-81d9-07b3a42074ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_EnterpriseRoutersMember_aa2a7570-237a-49b5-b0da-6931ac4cdc8d" xlink:href="dgii-20240331.xsd#dgii_EnterpriseRoutersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReportingUnitDomain_4cfebccd-7c73-4f77-81d9-07b3a42074ad" xlink:to="loc_dgii_EnterpriseRoutersMember_aa2a7570-237a-49b5-b0da-6931ac4cdc8d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_ConsoleServersMember_9b64f003-04d2-4c82-ad2f-44a7fa5425e5" xlink:href="dgii-20240331.xsd#dgii_ConsoleServersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReportingUnitDomain_4cfebccd-7c73-4f77-81d9-07b3a42074ad" xlink:to="loc_dgii_ConsoleServersMember_9b64f003-04d2-4c82-ad2f-44a7fa5425e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_OEMSolutionsMember_07918ef9-607b-4ab4-87f0-6950b2b79619" xlink:href="dgii-20240331.xsd#dgii_OEMSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReportingUnitDomain_4cfebccd-7c73-4f77-81d9-07b3a42074ad" xlink:to="loc_dgii_OEMSolutionsMember_07918ef9-607b-4ab4-87f0-6950b2b79619" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_InfrastructureMgmtMember_8924daac-6012-4813-8cf3-edd13ffd430e" xlink:href="dgii-20240331.xsd#dgii_InfrastructureMgmtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReportingUnitDomain_4cfebccd-7c73-4f77-81d9-07b3a42074ad" xlink:to="loc_dgii_InfrastructureMgmtMember_8924daac-6012-4813-8cf3-edd13ffd430e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_SmartSenseMember_771ade03-c1cc-4316-9b99-782a63fe0afe" xlink:href="dgii-20240331.xsd#dgii_SmartSenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReportingUnitDomain_4cfebccd-7c73-4f77-81d9-07b3a42074ad" xlink:to="loc_dgii_SmartSenseMember_771ade03-c1cc-4316-9b99-782a63fe0afe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_VentusMember_d7401f48-47e3-4359-9ff1-88e33efa339b" xlink:href="dgii-20240331.xsd#dgii_VentusMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReportingUnitDomain_4cfebccd-7c73-4f77-81d9-07b3a42074ad" xlink:to="loc_dgii_VentusMember_d7401f48-47e3-4359-9ff1-88e33efa339b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_eb25c640-921f-492a-a049-bd3eb38aa0f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_141c0149-ab86-43cb-99da-a5f24499b9e5" xlink:to="loc_us-gaap_NumberOfReportableSegments_eb25c640-921f-492a-a049-bd3eb38aa0f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_58cab6b2-00f4-4aa2-b02c-feb1c4026d5a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_141c0149-ab86-43cb-99da-a5f24499b9e5" xlink:to="loc_us-gaap_Goodwill_58cab6b2-00f4-4aa2-b02c-feb1c4026d5a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/GoodwillandOtherIdentifiableIntangibleAssetsNetGoodwillRollforwardDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#GoodwillandOtherIdentifiableIntangibleAssetsNetGoodwillRollforwardDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/GoodwillandOtherIdentifiableIntangibleAssetsNetGoodwillRollforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_ba38a198-29ee-4b66-9db6-59691fe76682" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_7faf66da-b706-47c0-b43d-a56224068716" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_ba38a198-29ee-4b66-9db6-59691fe76682" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_7faf66da-b706-47c0-b43d-a56224068716" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_95ad4823-7fc1-429c-9752-57cb0ad03cd0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_7faf66da-b706-47c0-b43d-a56224068716" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_95ad4823-7fc1-429c-9752-57cb0ad03cd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_95ad4823-7fc1-429c-9752-57cb0ad03cd0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_95ad4823-7fc1-429c-9752-57cb0ad03cd0" xlink:to="loc_us-gaap_SegmentDomain_95ad4823-7fc1-429c-9752-57cb0ad03cd0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_83864575-b80d-4682-a5e0-3bcc2baace2b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_95ad4823-7fc1-429c-9752-57cb0ad03cd0" xlink:to="loc_us-gaap_SegmentDomain_83864575-b80d-4682-a5e0-3bcc2baace2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_IoTProductsandServicesMember_e532c017-ade8-41b0-98b4-a44ccaadbd9c" xlink:href="dgii-20240331.xsd#dgii_IoTProductsandServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_83864575-b80d-4682-a5e0-3bcc2baace2b" xlink:to="loc_dgii_IoTProductsandServicesMember_e532c017-ade8-41b0-98b4-a44ccaadbd9c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_IoTSolutionsMember_164dece8-285c-4642-9540-79a79c3f74e0" xlink:href="dgii-20240331.xsd#dgii_IoTSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_83864575-b80d-4682-a5e0-3bcc2baace2b" xlink:to="loc_dgii_IoTSolutionsMember_164dece8-285c-4642-9540-79a79c3f74e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_65ccc6f0-22ba-4e9f-82a4-e67ba1539c45" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_ba38a198-29ee-4b66-9db6-59691fe76682" xlink:to="loc_us-gaap_GoodwillRollForward_65ccc6f0-22ba-4e9f-82a4-e67ba1539c45" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_fdfc6029-5f14-4733-bca9-4e01514d217a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_65ccc6f0-22ba-4e9f-82a4-e67ba1539c45" xlink:to="loc_us-gaap_Goodwill_fdfc6029-5f14-4733-bca9-4e01514d217a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_c6dfe2dd-9d3c-47a7-9568-55ca2274058c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_65ccc6f0-22ba-4e9f-82a4-e67ba1539c45" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_c6dfe2dd-9d3c-47a7-9568-55ca2274058c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_53fcaf05-411b-4019-a80c-8439bdf7e79a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/IndebtednessNarrativeDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#IndebtednessNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/IndebtednessNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_30bdc04e-0375-4268-bfd0-2060c94859c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_7d3a9b83-ff90-4e5e-9347-a5dab8da385d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_30bdc04e-0375-4268-bfd0-2060c94859c2" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_7d3a9b83-ff90-4e5e-9347-a5dab8da385d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_1cb776ce-781c-4a94-b809-fa546bb56218" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d3a9b83-ff90-4e5e-9347-a5dab8da385d" xlink:to="loc_us-gaap_CreditFacilityAxis_1cb776ce-781c-4a94-b809-fa546bb56218" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_1cb776ce-781c-4a94-b809-fa546bb56218_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_1cb776ce-781c-4a94-b809-fa546bb56218" xlink:to="loc_us-gaap_CreditFacilityDomain_1cb776ce-781c-4a94-b809-fa546bb56218_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_e3db5fa0-5776-4055-81f6-d10504ae20a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_1cb776ce-781c-4a94-b809-fa546bb56218" xlink:to="loc_us-gaap_CreditFacilityDomain_e3db5fa0-5776-4055-81f6-d10504ae20a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_e7cf5993-1296-4cbf-bf53-dfc886fb7f5f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_e3db5fa0-5776-4055-81f6-d10504ae20a3" xlink:to="loc_us-gaap_SecuredDebtMember_e7cf5993-1296-4cbf-bf53-dfc886fb7f5f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_44872cde-a714-4ec7-8969-6711e7ae1f88" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_e3db5fa0-5776-4055-81f6-d10504ae20a3" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_44872cde-a714-4ec7-8969-6711e7ae1f88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_d293b250-48e8-4504-970f-6b4b34fff201" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_e3db5fa0-5776-4055-81f6-d10504ae20a3" xlink:to="loc_us-gaap_LetterOfCreditMember_d293b250-48e8-4504-970f-6b4b34fff201" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_SwinglineCreditFacilityMember_f4c72684-e64b-4ea3-b670-c603cdf39cca" xlink:href="dgii-20240331.xsd#dgii_SwinglineCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_e3db5fa0-5776-4055-81f6-d10504ae20a3" xlink:to="loc_dgii_SwinglineCreditFacilityMember_f4c72684-e64b-4ea3-b670-c603cdf39cca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_9d44c17f-5d51-42fd-9c5e-fbfa5a0f3d1b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d3a9b83-ff90-4e5e-9347-a5dab8da385d" xlink:to="loc_us-gaap_VariableRateAxis_9d44c17f-5d51-42fd-9c5e-fbfa5a0f3d1b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_9d44c17f-5d51-42fd-9c5e-fbfa5a0f3d1b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_9d44c17f-5d51-42fd-9c5e-fbfa5a0f3d1b" xlink:to="loc_us-gaap_VariableRateDomain_9d44c17f-5d51-42fd-9c5e-fbfa5a0f3d1b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_548a7069-b52c-410e-8389-fb9a24302930" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_9d44c17f-5d51-42fd-9c5e-fbfa5a0f3d1b" xlink:to="loc_us-gaap_VariableRateDomain_548a7069-b52c-410e-8389-fb9a24302930" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_BenchmarkRateMember_207f617b-aa57-41a8-a350-3814b85101bf" xlink:href="dgii-20240331.xsd#dgii_BenchmarkRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_548a7069-b52c-410e-8389-fb9a24302930" xlink:to="loc_dgii_BenchmarkRateMember_207f617b-aa57-41a8-a350-3814b85101bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_d820e922-a194-471f-ace2-1a6ef717d6bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_548a7069-b52c-410e-8389-fb9a24302930" xlink:to="loc_us-gaap_BaseRateMember_d820e922-a194-471f-ace2-1a6ef717d6bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_6ca9b6bd-7780-4f9c-9a58-fe0eb5ee5869" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d3a9b83-ff90-4e5e-9347-a5dab8da385d" xlink:to="loc_srt_RangeAxis_6ca9b6bd-7780-4f9c-9a58-fe0eb5ee5869" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6ca9b6bd-7780-4f9c-9a58-fe0eb5ee5869_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_6ca9b6bd-7780-4f9c-9a58-fe0eb5ee5869" xlink:to="loc_srt_RangeMember_6ca9b6bd-7780-4f9c-9a58-fe0eb5ee5869_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d67a7336-6ad5-4e88-9ce9-ca55415cc497" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_6ca9b6bd-7780-4f9c-9a58-fe0eb5ee5869" xlink:to="loc_srt_RangeMember_d67a7336-6ad5-4e88-9ce9-ca55415cc497" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_583f5fcc-256b-4d0e-b750-14f2a20d411b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d67a7336-6ad5-4e88-9ce9-ca55415cc497" xlink:to="loc_srt_MinimumMember_583f5fcc-256b-4d0e-b750-14f2a20d411b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_0fbc8733-e9cc-419c-9412-293557023b52" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d67a7336-6ad5-4e88-9ce9-ca55415cc497" xlink:to="loc_srt_MaximumMember_0fbc8733-e9cc-419c-9412-293557023b52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_BaseRateElectionAxis_e57122b8-fe62-4ef7-b4d3-e5be2b8431af" xlink:href="dgii-20240331.xsd#dgii_BaseRateElectionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d3a9b83-ff90-4e5e-9347-a5dab8da385d" xlink:to="loc_dgii_BaseRateElectionAxis_e57122b8-fe62-4ef7-b4d3-e5be2b8431af" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_BaseRateElectionDomain_e57122b8-fe62-4ef7-b4d3-e5be2b8431af_default" xlink:href="dgii-20240331.xsd#dgii_BaseRateElectionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dgii_BaseRateElectionAxis_e57122b8-fe62-4ef7-b4d3-e5be2b8431af" xlink:to="loc_dgii_BaseRateElectionDomain_e57122b8-fe62-4ef7-b4d3-e5be2b8431af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_BaseRateElectionDomain_ee1a450c-0e9d-448f-b3bb-5f3b31833aea" xlink:href="dgii-20240331.xsd#dgii_BaseRateElectionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dgii_BaseRateElectionAxis_e57122b8-fe62-4ef7-b4d3-e5be2b8431af" xlink:to="loc_dgii_BaseRateElectionDomain_ee1a450c-0e9d-448f-b3bb-5f3b31833aea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_FederalFundsRateMember_0e0c2cf5-d5f7-4ae5-8fdf-94220c191eca" xlink:href="dgii-20240331.xsd#dgii_FederalFundsRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dgii_BaseRateElectionDomain_ee1a450c-0e9d-448f-b3bb-5f3b31833aea" xlink:to="loc_dgii_FederalFundsRateMember_0e0c2cf5-d5f7-4ae5-8fdf-94220c191eca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_LIBORMember_2bbdc91b-bcd9-4ae3-99be-6feb5ca772dc" xlink:href="dgii-20240331.xsd#dgii_LIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dgii_BaseRateElectionDomain_ee1a450c-0e9d-448f-b3bb-5f3b31833aea" xlink:to="loc_dgii_LIBORMember_2bbdc91b-bcd9-4ae3-99be-6feb5ca772dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_CreditAgreementAxis_3ba1f9b6-fb4c-46ea-9b5f-d8c5b712b143" xlink:href="dgii-20240331.xsd#dgii_CreditAgreementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d3a9b83-ff90-4e5e-9347-a5dab8da385d" xlink:to="loc_dgii_CreditAgreementAxis_3ba1f9b6-fb4c-46ea-9b5f-d8c5b712b143" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_CreditAgreementDomain_3ba1f9b6-fb4c-46ea-9b5f-d8c5b712b143_default" xlink:href="dgii-20240331.xsd#dgii_CreditAgreementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dgii_CreditAgreementAxis_3ba1f9b6-fb4c-46ea-9b5f-d8c5b712b143" xlink:to="loc_dgii_CreditAgreementDomain_3ba1f9b6-fb4c-46ea-9b5f-d8c5b712b143_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_CreditAgreementDomain_17f852e7-5a20-44d7-8592-c569fc17c410" xlink:href="dgii-20240331.xsd#dgii_CreditAgreementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dgii_CreditAgreementAxis_3ba1f9b6-fb4c-46ea-9b5f-d8c5b712b143" xlink:to="loc_dgii_CreditAgreementDomain_17f852e7-5a20-44d7-8592-c569fc17c410" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_PriorCreditFacilityMember_52c4b774-b903-4b98-a1b4-e273a4477e07" xlink:href="dgii-20240331.xsd#dgii_PriorCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dgii_CreditAgreementDomain_17f852e7-5a20-44d7-8592-c569fc17c410" xlink:to="loc_dgii_PriorCreditFacilityMember_52c4b774-b903-4b98-a1b4-e273a4477e07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_December72023CreditAgreementMember_fc3ea836-b9ff-450f-ad88-92efb6822ac4" xlink:href="dgii-20240331.xsd#dgii_December72023CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dgii_CreditAgreementDomain_17f852e7-5a20-44d7-8592-c569fc17c410" xlink:to="loc_dgii_December72023CreditAgreementMember_fc3ea836-b9ff-450f-ad88-92efb6822ac4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_28257668-c2b1-4058-bc39-1f7f4544bc15" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d3a9b83-ff90-4e5e-9347-a5dab8da385d" xlink:to="loc_us-gaap_DebtInstrumentAxis_28257668-c2b1-4058-bc39-1f7f4544bc15" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_28257668-c2b1-4058-bc39-1f7f4544bc15_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_28257668-c2b1-4058-bc39-1f7f4544bc15" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_28257668-c2b1-4058-bc39-1f7f4544bc15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_82f7a193-8cde-42c9-ba03-03eb72e73db4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_28257668-c2b1-4058-bc39-1f7f4544bc15" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_82f7a193-8cde-42c9-ba03-03eb72e73db4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_CreditAgreementDomain_8d45b282-d4cf-46d0-997a-07ce887b4bbe" xlink:href="dgii-20240331.xsd#dgii_CreditAgreementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_82f7a193-8cde-42c9-ba03-03eb72e73db4" xlink:to="loc_dgii_CreditAgreementDomain_8d45b282-d4cf-46d0-997a-07ce887b4bbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_991fbf5d-36a3-4fcf-8ecb-63aa7eb7af51" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d3a9b83-ff90-4e5e-9347-a5dab8da385d" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_991fbf5d-36a3-4fcf-8ecb-63aa7eb7af51" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_991fbf5d-36a3-4fcf-8ecb-63aa7eb7af51_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_991fbf5d-36a3-4fcf-8ecb-63aa7eb7af51" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_991fbf5d-36a3-4fcf-8ecb-63aa7eb7af51_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_40100033-8aef-4b64-81d0-6c2d9b1ee21b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_991fbf5d-36a3-4fcf-8ecb-63aa7eb7af51" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_40100033-8aef-4b64-81d0-6c2d9b1ee21b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_dee1c8d9-24c2-40fd-a082-30b8e40932fd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_40100033-8aef-4b64-81d0-6c2d9b1ee21b" xlink:to="loc_us-gaap_LineOfCreditMember_dee1c8d9-24c2-40fd-a082-30b8e40932fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_a9b532ef-e5c2-4e76-a89a-11fc93af86db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_30bdc04e-0375-4268-bfd0-2060c94859c2" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_a9b532ef-e5c2-4e76-a89a-11fc93af86db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_LineOfCreditFacilityAccordionFeatureIncreaseLimit_232b22bf-570b-4b87-888d-3d6913c0c63d" xlink:href="dgii-20240331.xsd#dgii_LineOfCreditFacilityAccordionFeatureIncreaseLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_30bdc04e-0375-4268-bfd0-2060c94859c2" xlink:to="loc_dgii_LineOfCreditFacilityAccordionFeatureIncreaseLimit_232b22bf-570b-4b87-888d-3d6913c0c63d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_d881d658-c146-4f8b-9a6c-b894926bcb0c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_30bdc04e-0375-4268-bfd0-2060c94859c2" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_d881d658-c146-4f8b-9a6c-b894926bcb0c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4a964cc5-ef85-4780-a69e-d11262bc58a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_30bdc04e-0375-4268-bfd0-2060c94859c2" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4a964cc5-ef85-4780-a69e-d11262bc58a7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_a4bdfab3-bd56-42ea-92b0-9240f42af204" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_30bdc04e-0375-4268-bfd0-2060c94859c2" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_a4bdfab3-bd56-42ea-92b0-9240f42af204" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_89e29420-112e-4a79-9ba3-f88673ba980d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_30bdc04e-0375-4268-bfd0-2060c94859c2" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_89e29420-112e-4a79-9ba3-f88673ba980d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_0cfc4d8d-21c7-464b-857e-e810dd3857dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_30bdc04e-0375-4268-bfd0-2060c94859c2" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_0cfc4d8d-21c7-464b-857e-e810dd3857dc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_DebtInstrumentCovenantLeverageRatioMinimum_c6298c29-580a-4733-b128-c36a1ae22622" xlink:href="dgii-20240331.xsd#dgii_DebtInstrumentCovenantLeverageRatioMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_30bdc04e-0375-4268-bfd0-2060c94859c2" xlink:to="loc_dgii_DebtInstrumentCovenantLeverageRatioMinimum_c6298c29-580a-4733-b128-c36a1ae22622" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_DebtInstrumentCovenantLiquidityRatioTotalNetLeverageRatio_679c8589-bcf7-47dc-ae0e-37c7c9545b88" xlink:href="dgii-20240331.xsd#dgii_DebtInstrumentCovenantLiquidityRatioTotalNetLeverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_30bdc04e-0375-4268-bfd0-2060c94859c2" xlink:to="loc_dgii_DebtInstrumentCovenantLiquidityRatioTotalNetLeverageRatio_679c8589-bcf7-47dc-ae0e-37c7c9545b88" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_DebtInstrumentCovenantHoliday_6097114c-aaf5-4d76-b8a2-7941ebb67447" xlink:href="dgii-20240331.xsd#dgii_DebtInstrumentCovenantHoliday"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_30bdc04e-0375-4268-bfd0-2060c94859c2" xlink:to="loc_dgii_DebtInstrumentCovenantHoliday_6097114c-aaf5-4d76-b8a2-7941ebb67447" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/IndebtednessScheduleofLongTermDebtDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#IndebtednessScheduleofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/IndebtednessScheduleofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_fbece4ab-8a3f-4a48-808e-f5a6863b7c8a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_efc17cff-01bc-490d-b8df-c8fce81f7046" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fbece4ab-8a3f-4a48-808e-f5a6863b7c8a" xlink:to="loc_us-gaap_DebtInstrumentTable_efc17cff-01bc-490d-b8df-c8fce81f7046" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_65b0b74b-cb49-4e67-96bf-77d268f5456b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_efc17cff-01bc-490d-b8df-c8fce81f7046" xlink:to="loc_us-gaap_CreditFacilityAxis_65b0b74b-cb49-4e67-96bf-77d268f5456b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_65b0b74b-cb49-4e67-96bf-77d268f5456b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_65b0b74b-cb49-4e67-96bf-77d268f5456b" xlink:to="loc_us-gaap_CreditFacilityDomain_65b0b74b-cb49-4e67-96bf-77d268f5456b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_52233f01-6a1f-4f2c-8128-ebe27d3a7598" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_65b0b74b-cb49-4e67-96bf-77d268f5456b" xlink:to="loc_us-gaap_CreditFacilityDomain_52233f01-6a1f-4f2c-8128-ebe27d3a7598" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_584afb12-ae76-4476-986f-e044e2c1d75a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_52233f01-6a1f-4f2c-8128-ebe27d3a7598" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_584afb12-ae76-4476-986f-e044e2c1d75a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_5ee43388-8635-44ca-9ad5-800b787951f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_52233f01-6a1f-4f2c-8128-ebe27d3a7598" xlink:to="loc_us-gaap_SecuredDebtMember_5ee43388-8635-44ca-9ad5-800b787951f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_CreditAgreementAxis_152abeda-0dfd-46bd-b144-a504f9106100" xlink:href="dgii-20240331.xsd#dgii_CreditAgreementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_efc17cff-01bc-490d-b8df-c8fce81f7046" xlink:to="loc_dgii_CreditAgreementAxis_152abeda-0dfd-46bd-b144-a504f9106100" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_CreditAgreementDomain_152abeda-0dfd-46bd-b144-a504f9106100_default" xlink:href="dgii-20240331.xsd#dgii_CreditAgreementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dgii_CreditAgreementAxis_152abeda-0dfd-46bd-b144-a504f9106100" xlink:to="loc_dgii_CreditAgreementDomain_152abeda-0dfd-46bd-b144-a504f9106100_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_CreditAgreementDomain_1ed58bca-a894-4fe8-b1b5-096b4a9490e0" xlink:href="dgii-20240331.xsd#dgii_CreditAgreementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dgii_CreditAgreementAxis_152abeda-0dfd-46bd-b144-a504f9106100" xlink:to="loc_dgii_CreditAgreementDomain_1ed58bca-a894-4fe8-b1b5-096b4a9490e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_December72023CreditAgreementMember_a967b25c-d737-4761-b797-472878db9623" xlink:href="dgii-20240331.xsd#dgii_December72023CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dgii_CreditAgreementDomain_1ed58bca-a894-4fe8-b1b5-096b4a9490e0" xlink:to="loc_dgii_December72023CreditAgreementMember_a967b25c-d737-4761-b797-472878db9623" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_PriorCreditFacilityMember_29fd64b2-5743-41ef-b95c-a72406523df0" xlink:href="dgii-20240331.xsd#dgii_PriorCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dgii_CreditAgreementDomain_1ed58bca-a894-4fe8-b1b5-096b4a9490e0" xlink:to="loc_dgii_PriorCreditFacilityMember_29fd64b2-5743-41ef-b95c-a72406523df0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_8493bd7b-93fd-4067-a8da-be2e32208fd1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fbece4ab-8a3f-4a48-808e-f5a6863b7c8a" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_8493bd7b-93fd-4067-a8da-be2e32208fd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_b1991c21-62e4-4bf9-b2ae-fba965f7d59c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fbece4ab-8a3f-4a48-808e-f5a6863b7c8a" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_b1991c21-62e4-4bf9-b2ae-fba965f7d59c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_fc7b7650-2841-45d0-90ce-afa61914a31d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fbece4ab-8a3f-4a48-808e-f5a6863b7c8a" xlink:to="loc_us-gaap_LongTermDebtCurrent_fc7b7650-2841-45d0-90ce-afa61914a31d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_f3d1a6c5-67cf-4c28-a2b5-8022f67d081a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fbece4ab-8a3f-4a48-808e-f5a6863b7c8a" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_f3d1a6c5-67cf-4c28-a2b5-8022f67d081a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7d24519d-3a09-4662-bda5-d16ef63634bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fbece4ab-8a3f-4a48-808e-f5a6863b7c8a" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7d24519d-3a09-4662-bda5-d16ef63634bb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_c568573c-8374-4105-9b33-edd6427ccb7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fbece4ab-8a3f-4a48-808e-f5a6863b7c8a" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_c568573c-8374-4105-9b33-edd6427ccb7a" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/SegmentInformationDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#SegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/SegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_0d66fedb-4ba0-43fb-b597-10195e389ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_59fd1e16-ffaf-4c57-bc1f-addac64428b7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_0d66fedb-4ba0-43fb-b597-10195e389ff3" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_59fd1e16-ffaf-4c57-bc1f-addac64428b7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2c12eb18-0e13-428b-80e1-b19f4a55e7a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_59fd1e16-ffaf-4c57-bc1f-addac64428b7" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_2c12eb18-0e13-428b-80e1-b19f4a55e7a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_2c12eb18-0e13-428b-80e1-b19f4a55e7a7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2c12eb18-0e13-428b-80e1-b19f4a55e7a7" xlink:to="loc_us-gaap_SegmentDomain_2c12eb18-0e13-428b-80e1-b19f4a55e7a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_8fafcba3-7feb-4330-af76-cd7b8c95beb4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2c12eb18-0e13-428b-80e1-b19f4a55e7a7" xlink:to="loc_us-gaap_SegmentDomain_8fafcba3-7feb-4330-af76-cd7b8c95beb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_IoTProductsandServicesMember_ff5de216-be76-40f6-8b99-e3b427f46f82" xlink:href="dgii-20240331.xsd#dgii_IoTProductsandServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8fafcba3-7feb-4330-af76-cd7b8c95beb4" xlink:to="loc_dgii_IoTProductsandServicesMember_ff5de216-be76-40f6-8b99-e3b427f46f82" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_IoTSolutionsMember_acabfc4b-f7a2-4fa0-96c4-850e8af40494" xlink:href="dgii-20240331.xsd#dgii_IoTSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8fafcba3-7feb-4330-af76-cd7b8c95beb4" xlink:to="loc_dgii_IoTSolutionsMember_acabfc4b-f7a2-4fa0-96c4-850e8af40494" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsConsolidationItemsAxis_3602f4f3-1210-4e7c-9635-3f904b589524" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsegmentsConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_59fd1e16-ffaf-4c57-bc1f-addac64428b7" xlink:to="loc_us-gaap_SubsegmentsConsolidationItemsAxis_3602f4f3-1210-4e7c-9635-3f904b589524" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsConsolidationItemsDomain_3602f4f3-1210-4e7c-9635-3f904b589524_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsegmentsConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsConsolidationItemsAxis_3602f4f3-1210-4e7c-9635-3f904b589524" xlink:to="loc_us-gaap_SubsegmentsConsolidationItemsDomain_3602f4f3-1210-4e7c-9635-3f904b589524_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsConsolidationItemsDomain_eef988c1-2486-492d-b4a4-39bd093823dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsegmentsConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsConsolidationItemsAxis_3602f4f3-1210-4e7c-9635-3f904b589524" xlink:to="loc_us-gaap_SubsegmentsConsolidationItemsDomain_eef988c1-2486-492d-b4a4-39bd093823dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportableSubsegmentsMember_3a1b3c0c-9df3-42f0-a32e-428595508edf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReportableSubsegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsConsolidationItemsDomain_eef988c1-2486-492d-b4a4-39bd093823dc" xlink:to="loc_us-gaap_ReportableSubsegmentsMember_3a1b3c0c-9df3-42f0-a32e-428595508edf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersubsegmentEliminationsMember_dea02ff5-c8e4-47fd-a217-24dece95034d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntersubsegmentEliminationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsConsolidationItemsDomain_eef988c1-2486-492d-b4a4-39bd093823dc" xlink:to="loc_us-gaap_IntersubsegmentEliminationsMember_dea02ff5-c8e4-47fd-a217-24dece95034d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_95433238-82e7-44ba-9d7d-43764a3b6db3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_0d66fedb-4ba0-43fb-b597-10195e389ff3" xlink:to="loc_us-gaap_NumberOfReportableSegments_95433238-82e7-44ba-9d7d-43764a3b6db3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_586abea6-a99e-421e-ae3e-245aca1e78bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_0d66fedb-4ba0-43fb-b597-10195e389ff3" xlink:to="loc_us-gaap_NumberOfOperatingSegments_586abea6-a99e-421e-ae3e-245aca1e78bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_c4117a50-77ec-4b21-87da-c72ea289bc99" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_0d66fedb-4ba0-43fb-b597-10195e389ff3" xlink:to="loc_us-gaap_Revenues_c4117a50-77ec-4b21-87da-c72ea289bc99" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_e8365681-1cf5-4e84-951a-d4c16eb8aafd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_0d66fedb-4ba0-43fb-b597-10195e389ff3" xlink:to="loc_us-gaap_GrossProfit_e8365681-1cf5-4e84-951a-d4c16eb8aafd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_6bb4e5a7-ff97-4c9e-9351-9cd9fbc1a878" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_0d66fedb-4ba0-43fb-b597-10195e389ff3" xlink:to="loc_us-gaap_OperatingIncomeLoss_6bb4e5a7-ff97-4c9e-9351-9cd9fbc1a878" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_db0462d4-e445-4883-af42-77d5f103b670" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_0d66fedb-4ba0-43fb-b597-10195e389ff3" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_db0462d4-e445-4883-af42-77d5f103b670" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/SegmentInformationExpendedforPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#SegmentInformationExpendedforPropertyPlantandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/SegmentInformationExpendedforPropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_48e1cf69-0cc6-4d64-8a95-2f04c29a34f4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_8ae2d95f-ea2e-41fa-b8e2-a5c083ceeaeb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_48e1cf69-0cc6-4d64-8a95-2f04c29a34f4" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_8ae2d95f-ea2e-41fa-b8e2-a5c083ceeaeb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_5085f94a-97ef-4bb4-baef-be9e0466ba51" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_8ae2d95f-ea2e-41fa-b8e2-a5c083ceeaeb" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_5085f94a-97ef-4bb4-baef-be9e0466ba51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5085f94a-97ef-4bb4-baef-be9e0466ba51_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5085f94a-97ef-4bb4-baef-be9e0466ba51" xlink:to="loc_us-gaap_SegmentDomain_5085f94a-97ef-4bb4-baef-be9e0466ba51_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_8e1c8b49-93e4-4139-a39a-a53d2eeaeec7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5085f94a-97ef-4bb4-baef-be9e0466ba51" xlink:to="loc_us-gaap_SegmentDomain_8e1c8b49-93e4-4139-a39a-a53d2eeaeec7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_IoTProductsandServicesMember_2ac797fa-37a2-49fa-a901-3f05d838b591" xlink:href="dgii-20240331.xsd#dgii_IoTProductsandServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8e1c8b49-93e4-4139-a39a-a53d2eeaeec7" xlink:to="loc_dgii_IoTProductsandServicesMember_2ac797fa-37a2-49fa-a901-3f05d838b591" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_IoTSolutionsMember_f2c60e83-8e7d-456d-8621-7a5882c34637" xlink:href="dgii-20240331.xsd#dgii_IoTSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8e1c8b49-93e4-4139-a39a-a53d2eeaeec7" xlink:to="loc_dgii_IoTSolutionsMember_f2c60e83-8e7d-456d-8621-7a5882c34637" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_InventoryTransferToPropertyPlantAndEquipment_6d276106-f1c3-42ca-bd7a-44b515a97fbf" xlink:href="dgii-20240331.xsd#dgii_InventoryTransferToPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_48e1cf69-0cc6-4d64-8a95-2f04c29a34f4" xlink:to="loc_dgii_InventoryTransferToPropertyPlantAndEquipment_6d276106-f1c3-42ca-bd7a-44b515a97fbf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_7756bc12-6392-47f2-874a-3b6162139a0e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentExpenditureAdditionToLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_48e1cf69-0cc6-4d64-8a95-2f04c29a34f4" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_7756bc12-6392-47f2-874a-3b6162139a0e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/SegmentInformationTotalAssetsDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#SegmentInformationTotalAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/SegmentInformationTotalAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingAssetReconcilingItemLineItems_b09884a7-55a2-43b3-a2d5-700cf75ba09f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingAssetReconcilingItemLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTable_f61d6fb2-6186-4468-a812-5cfa42b408de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingAssetReconcilingItemLineItems_b09884a7-55a2-43b3-a2d5-700cf75ba09f" xlink:to="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTable_f61d6fb2-6186-4468-a812-5cfa42b408de" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_a5382742-1ce3-4a3b-a6c9-46d8d114d8ae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTable_f61d6fb2-6186-4468-a812-5cfa42b408de" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_a5382742-1ce3-4a3b-a6c9-46d8d114d8ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a5382742-1ce3-4a3b-a6c9-46d8d114d8ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a5382742-1ce3-4a3b-a6c9-46d8d114d8ae" xlink:to="loc_us-gaap_SegmentDomain_a5382742-1ce3-4a3b-a6c9-46d8d114d8ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a5de7c9b-e390-4711-b716-ad488289854e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a5382742-1ce3-4a3b-a6c9-46d8d114d8ae" xlink:to="loc_us-gaap_SegmentDomain_a5de7c9b-e390-4711-b716-ad488289854e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_IoTProductsandServicesMember_1bed720d-a5ad-4bd8-96dc-c6e0b242f0ed" xlink:href="dgii-20240331.xsd#dgii_IoTProductsandServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a5de7c9b-e390-4711-b716-ad488289854e" xlink:to="loc_dgii_IoTProductsandServicesMember_1bed720d-a5ad-4bd8-96dc-c6e0b242f0ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_IoTSolutionsMember_01a5cbc4-42ef-4266-a997-e61a4497145d" xlink:href="dgii-20240331.xsd#dgii_IoTSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a5de7c9b-e390-4711-b716-ad488289854e" xlink:to="loc_dgii_IoTSolutionsMember_01a5cbc4-42ef-4266-a997-e61a4497145d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateMember_e264bec8-4d5f-400e-93c0-15addbe3579b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CorporateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a5de7c9b-e390-4711-b716-ad488289854e" xlink:to="loc_us-gaap_CorporateMember_e264bec8-4d5f-400e-93c0-15addbe3579b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_ccb3b797-13db-450f-952e-b59fbfa39c71" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingAssetReconcilingItemLineItems_b09884a7-55a2-43b3-a2d5-700cf75ba09f" xlink:to="loc_us-gaap_Assets_ccb3b797-13db-450f-952e-b59fbfa39c71" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/RevenueDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#RevenueDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/RevenueDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_39ab8e1c-b424-446f-8922-eb47a3b8a07b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_9737ef92-8039-4837-b509-0af1ef7f49bc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_39ab8e1c-b424-446f-8922-eb47a3b8a07b" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_9737ef92-8039-4837-b509-0af1ef7f49bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_8ff8cf2e-9742-44c7-a779-88805d20d45a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_9737ef92-8039-4837-b509-0af1ef7f49bc" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_8ff8cf2e-9742-44c7-a779-88805d20d45a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_8ff8cf2e-9742-44c7-a779-88805d20d45a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_8ff8cf2e-9742-44c7-a779-88805d20d45a" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_8ff8cf2e-9742-44c7-a779-88805d20d45a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_e2ed97b5-f375-46bd-8429-a2371445cb65" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_8ff8cf2e-9742-44c7-a779-88805d20d45a" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_e2ed97b5-f375-46bd-8429-a2371445cb65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_f858ab1c-b00e-4669-a6e2-516e50af8aaa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_e2ed97b5-f375-46bd-8429-a2371445cb65" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_f858ab1c-b00e-4669-a6e2-516e50af8aaa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_8fdf3e52-a7c1-4b69-807c-18094c827dea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TransferredOverTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_e2ed97b5-f375-46bd-8429-a2371445cb65" xlink:to="loc_us-gaap_TransferredOverTimeMember_8fdf3e52-a7c1-4b69-807c-18094c827dea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_b40b83c2-52c3-45ef-bb4b-eabd4d5ea445" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_9737ef92-8039-4837-b509-0af1ef7f49bc" xlink:to="loc_srt_StatementGeographicalAxis_b40b83c2-52c3-45ef-bb4b-eabd4d5ea445" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_b40b83c2-52c3-45ef-bb4b-eabd4d5ea445_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_b40b83c2-52c3-45ef-bb4b-eabd4d5ea445" xlink:to="loc_srt_SegmentGeographicalDomain_b40b83c2-52c3-45ef-bb4b-eabd4d5ea445_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_8c6a28f4-c78a-4559-b30b-7a8c4dc4d569" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_b40b83c2-52c3-45ef-bb4b-eabd4d5ea445" xlink:to="loc_srt_SegmentGeographicalDomain_8c6a28f4-c78a-4559-b30b-7a8c4dc4d569" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NorthAmericaMember_23fdf167-c6ae-4cc4-96bf-d27a193dba1e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_NorthAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8c6a28f4-c78a-4559-b30b-7a8c4dc4d569" xlink:to="loc_srt_NorthAmericaMember_23fdf167-c6ae-4cc4-96bf-d27a193dba1e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_7dbcdba7-2009-4085-b183-d0157401498f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8c6a28f4-c78a-4559-b30b-7a8c4dc4d569" xlink:to="loc_us-gaap_EMEAMember_7dbcdba7-2009-4085-b183-d0157401498f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_OtherlocationsMember_73d24572-2af9-411f-9a66-ee1ce34bd0af" xlink:href="dgii-20240331.xsd#dgii_OtherlocationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8c6a28f4-c78a-4559-b30b-7a8c4dc4d569" xlink:to="loc_dgii_OtherlocationsMember_73d24572-2af9-411f-9a66-ee1ce34bd0af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_5a2d549f-ff86-4813-8581-86efa730dcc6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_39ab8e1c-b424-446f-8922-eb47a3b8a07b" xlink:to="loc_us-gaap_Revenues_5a2d549f-ff86-4813-8581-86efa730dcc6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/RevenueAdditionalInformationDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#RevenueAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/RevenueAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_14434f6c-7192-4caf-b490-40c5f5120cbd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_6611d4b1-807e-484d-87f1-2d8160c873de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_14434f6c-7192-4caf-b490-40c5f5120cbd" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_6611d4b1-807e-484d-87f1-2d8160c873de" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAxis_689c1940-1d5b-426f-971c-859b766c6b52" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_6611d4b1-807e-484d-87f1-2d8160c873de" xlink:to="loc_us-gaap_CapitalizedContractCostAxis_689c1940-1d5b-426f-971c-859b766c6b52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_689c1940-1d5b-426f-971c-859b766c6b52_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_689c1940-1d5b-426f-971c-859b766c6b52" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_689c1940-1d5b-426f-971c-859b766c6b52_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_0a313da2-0876-4d9d-ae9d-cf24bdf1dac3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_689c1940-1d5b-426f-971c-859b766c6b52" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_0a313da2-0876-4d9d-ae9d-cf24bdf1dac3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_fb6fb891-4ef8-4f20-8d12-2005db95033d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_0a313da2-0876-4d9d-ae9d-cf24bdf1dac3" xlink:to="loc_us-gaap_EquipmentMember_fb6fb891-4ef8-4f20-8d12-2005db95033d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_c9315b0f-5240-42b7-bda4-779c69e6a356" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_6611d4b1-807e-484d-87f1-2d8160c873de" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_c9315b0f-5240-42b7-bda4-779c69e6a356" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_8c5ea92d-cda1-45a8-9d6d-7b59ea8f09c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_6611d4b1-807e-484d-87f1-2d8160c873de" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_8c5ea92d-cda1-45a8-9d6d-7b59ea8f09c7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8c5ea92d-cda1-45a8-9d6d-7b59ea8f09c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8c5ea92d-cda1-45a8-9d6d-7b59ea8f09c7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8c5ea92d-cda1-45a8-9d6d-7b59ea8f09c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9bf4782c-cb62-4c8b-bfe5-421b58a4bc7d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8c5ea92d-cda1-45a8-9d6d-7b59ea8f09c7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9bf4782c-cb62-4c8b-bfe5-421b58a4bc7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_VentusMember_6b120dc2-ca87-4890-a449-31e869479dd2" xlink:href="dgii-20240331.xsd#dgii_VentusMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9bf4782c-cb62-4c8b-bfe5-421b58a4bc7d" xlink:to="loc_dgii_VentusMember_6b120dc2-ca87-4890-a449-31e869479dd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_1b46d45e-a780-494b-9fd4-972573da0af5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_14434f6c-7192-4caf-b490-40c5f5120cbd" xlink:to="loc_us-gaap_CapitalizedContractCostNet_1b46d45e-a780-494b-9fd4-972573da0af5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_caf445e5-efdb-404d-8409-aaf15c4117e3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_14434f6c-7192-4caf-b490-40c5f5120cbd" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_caf445e5-efdb-404d-8409-aaf15c4117e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_9f6e8dfd-c423-4bbd-9d2a-261f807f59d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_14434f6c-7192-4caf-b490-40c5f5120cbd" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_9f6e8dfd-c423-4bbd-9d2a-261f807f59d3" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/RevenueAdditionalInformationDetails_1" xlink:type="simple" xlink:href="dgii-20240331.xsd#RevenueAdditionalInformationDetails_1"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/RevenueAdditionalInformationDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_14434f6c-7192-4caf-b490-40c5f5120cbd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_6611d4b1-807e-484d-87f1-2d8160c873de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_14434f6c-7192-4caf-b490-40c5f5120cbd" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_6611d4b1-807e-484d-87f1-2d8160c873de" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAxis_689c1940-1d5b-426f-971c-859b766c6b52" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_6611d4b1-807e-484d-87f1-2d8160c873de" xlink:to="loc_us-gaap_CapitalizedContractCostAxis_689c1940-1d5b-426f-971c-859b766c6b52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_689c1940-1d5b-426f-971c-859b766c6b52_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_689c1940-1d5b-426f-971c-859b766c6b52" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_689c1940-1d5b-426f-971c-859b766c6b52_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_0a313da2-0876-4d9d-ae9d-cf24bdf1dac3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_689c1940-1d5b-426f-971c-859b766c6b52" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_0a313da2-0876-4d9d-ae9d-cf24bdf1dac3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_fb6fb891-4ef8-4f20-8d12-2005db95033d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_0a313da2-0876-4d9d-ae9d-cf24bdf1dac3" xlink:to="loc_us-gaap_EquipmentMember_fb6fb891-4ef8-4f20-8d12-2005db95033d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_8c5ea92d-cda1-45a8-9d6d-7b59ea8f09c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_6611d4b1-807e-484d-87f1-2d8160c873de" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_8c5ea92d-cda1-45a8-9d6d-7b59ea8f09c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8c5ea92d-cda1-45a8-9d6d-7b59ea8f09c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8c5ea92d-cda1-45a8-9d6d-7b59ea8f09c7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8c5ea92d-cda1-45a8-9d6d-7b59ea8f09c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9bf4782c-cb62-4c8b-bfe5-421b58a4bc7d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8c5ea92d-cda1-45a8-9d6d-7b59ea8f09c7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9bf4782c-cb62-4c8b-bfe5-421b58a4bc7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_VentusMember_6b120dc2-ca87-4890-a449-31e869479dd2" xlink:href="dgii-20240331.xsd#dgii_VentusMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9bf4782c-cb62-4c8b-bfe5-421b58a4bc7d" xlink:to="loc_dgii_VentusMember_6b120dc2-ca87-4890-a449-31e869479dd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_1b46d45e-a780-494b-9fd4-972573da0af5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_14434f6c-7192-4caf-b490-40c5f5120cbd" xlink:to="loc_us-gaap_CapitalizedContractCostNet_1b46d45e-a780-494b-9fd4-972573da0af5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_caf445e5-efdb-404d-8409-aaf15c4117e3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_14434f6c-7192-4caf-b490-40c5f5120cbd" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_caf445e5-efdb-404d-8409-aaf15c4117e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_9f6e8dfd-c423-4bbd-9d2a-261f807f59d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_14434f6c-7192-4caf-b490-40c5f5120cbd" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_9f6e8dfd-c423-4bbd-9d2a-261f807f59d3" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/RevenueUnearnedRevenueDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#RevenueUnearnedRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/RevenueUnearnedRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_4d3e9095-28af-4244-8c23-f59867ca8792" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_13b84cbd-6ea7-4cb5-8576-17e4fc723c9e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_4d3e9095-28af-4244-8c23-f59867ca8792" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_13b84cbd-6ea7-4cb5-8576-17e4fc723c9e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_63790f55-fedd-4a22-9711-2fdbbb33839b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_13b84cbd-6ea7-4cb5-8576-17e4fc723c9e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_63790f55-fedd-4a22-9711-2fdbbb33839b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_63790f55-fedd-4a22-9711-2fdbbb33839b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_63790f55-fedd-4a22-9711-2fdbbb33839b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_63790f55-fedd-4a22-9711-2fdbbb33839b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fa44700c-c58c-43eb-ab7a-415379939977" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_63790f55-fedd-4a22-9711-2fdbbb33839b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fa44700c-c58c-43eb-ab7a-415379939977" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_VentusMember_c85bd61b-024a-48ab-928f-c73658ed6bd4" xlink:href="dgii-20240331.xsd#dgii_VentusMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fa44700c-c58c-43eb-ab7a-415379939977" xlink:to="loc_dgii_VentusMember_c85bd61b-024a-48ab-928f-c73658ed6bd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_1c66f2fd-93c1-41b1-8510-cb6820a3609b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_4d3e9095-28af-4244-8c23-f59867ca8792" xlink:to="loc_us-gaap_ContractWithCustomerLiability_1c66f2fd-93c1-41b1-8510-cb6820a3609b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_7b8ac4db-28a4-4ed9-8f8e-2d6a49da9d34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_4d3e9095-28af-4244-8c23-f59867ca8792" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_7b8ac4db-28a4-4ed9-8f8e-2d6a49da9d34" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/RevenuePerformanceObligationsDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#RevenuePerformanceObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/RevenuePerformanceObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_120d7447-5a3d-45a1-a039-c05d078c76ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_b9353e8e-fd42-431d-9aad-1ddfd9ecaa4a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_120d7447-5a3d-45a1-a039-c05d078c76ac" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_b9353e8e-fd42-431d-9aad-1ddfd9ecaa4a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_c34c04d7-c3a0-4fa1-b698-7d22b21b13de" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_b9353e8e-fd42-431d-9aad-1ddfd9ecaa4a" xlink:to="loc_srt_RangeAxis_c34c04d7-c3a0-4fa1-b698-7d22b21b13de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c34c04d7-c3a0-4fa1-b698-7d22b21b13de_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_c34c04d7-c3a0-4fa1-b698-7d22b21b13de" xlink:to="loc_srt_RangeMember_c34c04d7-c3a0-4fa1-b698-7d22b21b13de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_aaa7b2d3-f5d7-41b2-bffe-d356cb10058c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_c34c04d7-c3a0-4fa1-b698-7d22b21b13de" xlink:to="loc_srt_RangeMember_aaa7b2d3-f5d7-41b2-bffe-d356cb10058c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_403f259c-759b-4908-8c0d-84f04a0af65a" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_aaa7b2d3-f5d7-41b2-bffe-d356cb10058c" xlink:to="loc_srt_MinimumMember_403f259c-759b-4908-8c0d-84f04a0af65a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_44989123-78ec-4cf8-8388-a2d86e80e2f8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_aaa7b2d3-f5d7-41b2-bffe-d356cb10058c" xlink:to="loc_srt_MaximumMember_44989123-78ec-4cf8-8388-a2d86e80e2f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_3925967d-8435-4dc1-a831-8efc1820389c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_b9353e8e-fd42-431d-9aad-1ddfd9ecaa4a" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_3925967d-8435-4dc1-a831-8efc1820389c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6fc30c6f-50df-4a52-ad6d-96af06c886fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_120d7447-5a3d-45a1-a039-c05d078c76ac" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6fc30c6f-50df-4a52-ad6d-96af06c886fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_0d4bd34c-8ea9-4f6e-be1f-14d17b761d8e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_120d7447-5a3d-45a1-a039-c05d078c76ac" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_0d4bd34c-8ea9-4f6e-be1f-14d17b761d8e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/RevenuePerformanceObligationsDetails_1" xlink:type="simple" xlink:href="dgii-20240331.xsd#RevenuePerformanceObligationsDetails_1"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/RevenuePerformanceObligationsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_120d7447-5a3d-45a1-a039-c05d078c76ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_b9353e8e-fd42-431d-9aad-1ddfd9ecaa4a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_120d7447-5a3d-45a1-a039-c05d078c76ac" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_b9353e8e-fd42-431d-9aad-1ddfd9ecaa4a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_c34c04d7-c3a0-4fa1-b698-7d22b21b13de" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_b9353e8e-fd42-431d-9aad-1ddfd9ecaa4a" xlink:to="loc_srt_RangeAxis_c34c04d7-c3a0-4fa1-b698-7d22b21b13de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c34c04d7-c3a0-4fa1-b698-7d22b21b13de_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_c34c04d7-c3a0-4fa1-b698-7d22b21b13de" xlink:to="loc_srt_RangeMember_c34c04d7-c3a0-4fa1-b698-7d22b21b13de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_aaa7b2d3-f5d7-41b2-bffe-d356cb10058c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_c34c04d7-c3a0-4fa1-b698-7d22b21b13de" xlink:to="loc_srt_RangeMember_aaa7b2d3-f5d7-41b2-bffe-d356cb10058c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_403f259c-759b-4908-8c0d-84f04a0af65a" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_aaa7b2d3-f5d7-41b2-bffe-d356cb10058c" xlink:to="loc_srt_MinimumMember_403f259c-759b-4908-8c0d-84f04a0af65a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_44989123-78ec-4cf8-8388-a2d86e80e2f8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_aaa7b2d3-f5d7-41b2-bffe-d356cb10058c" xlink:to="loc_srt_MaximumMember_44989123-78ec-4cf8-8388-a2d86e80e2f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6fc30c6f-50df-4a52-ad6d-96af06c886fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_120d7447-5a3d-45a1-a039-c05d078c76ac" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6fc30c6f-50df-4a52-ad6d-96af06c886fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_0d4bd34c-8ea9-4f6e-be1f-14d17b761d8e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_120d7447-5a3d-45a1-a039-c05d078c76ac" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_0d4bd34c-8ea9-4f6e-be1f-14d17b761d8e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/IncomeTaxesUnrecognizedTaxBenefitsDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#IncomeTaxesUnrecognizedTaxBenefitsDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/IncomeTaxesUnrecognizedTaxBenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_9f97d84a-655b-4b6b-a354-7f6b5fbfb8ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_fd7807ba-ceb7-4521-bfce-96bd8a39b6ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_9f97d84a-655b-4b6b-a354-7f6b5fbfb8ff" xlink:to="loc_us-gaap_StatementTable_fd7807ba-ceb7-4521-bfce-96bd8a39b6ac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_c9335460-401f-4499-9feb-357bf37b7d90" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_fd7807ba-ceb7-4521-bfce-96bd8a39b6ac" xlink:to="loc_srt_RangeAxis_c9335460-401f-4499-9feb-357bf37b7d90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c9335460-401f-4499-9feb-357bf37b7d90_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_c9335460-401f-4499-9feb-357bf37b7d90" xlink:to="loc_srt_RangeMember_c9335460-401f-4499-9feb-357bf37b7d90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_7a8202dd-76ac-4fdc-94b8-3d74466893eb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_c9335460-401f-4499-9feb-357bf37b7d90" xlink:to="loc_srt_RangeMember_7a8202dd-76ac-4fdc-94b8-3d74466893eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_d662fbae-e89e-460e-9267-af9281310785" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_7a8202dd-76ac-4fdc-94b8-3d74466893eb" xlink:to="loc_srt_MaximumMember_d662fbae-e89e-460e-9267-af9281310785" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_c67f7bd0-6773-4858-8356-dc03959149e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9f97d84a-655b-4b6b-a354-7f6b5fbfb8ff" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_c67f7bd0-6773-4858-8356-dc03959149e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_5f6d46be-cf94-4fb0-9139-91aa8d52f129" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9f97d84a-655b-4b6b-a354-7f6b5fbfb8ff" xlink:to="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_5f6d46be-cf94-4fb0-9139-91aa8d52f129" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/StockBasedCompensationDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#StockBasedCompensationDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/StockBasedCompensationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b80882a6-92da-41ca-9d90-fb1350305502" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b80882a6-92da-41ca-9d90-fb1350305502" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_6b6b2b2b-9193-45dd-8fa4-0981448e5ba9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b80882a6-92da-41ca-9d90-fb1350305502" xlink:to="loc_us-gaap_PlanNameAxis_6b6b2b2b-9193-45dd-8fa4-0981448e5ba9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_6b6b2b2b-9193-45dd-8fa4-0981448e5ba9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_6b6b2b2b-9193-45dd-8fa4-0981448e5ba9" xlink:to="loc_us-gaap_PlanNameDomain_6b6b2b2b-9193-45dd-8fa4-0981448e5ba9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_024df53d-3147-4192-8d43-9e79ece4fa8c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_6b6b2b2b-9193-45dd-8fa4-0981448e5ba9" xlink:to="loc_us-gaap_PlanNameDomain_024df53d-3147-4192-8d43-9e79ece4fa8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_The2021PlanMember_5dcd2415-f8fe-400e-aa5d-b559dea30957" xlink:href="dgii-20240331.xsd#dgii_The2021PlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_024df53d-3147-4192-8d43-9e79ece4fa8c" xlink:to="loc_dgii_The2021PlanMember_5dcd2415-f8fe-400e-aa5d-b559dea30957" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_8744591c-f19d-4297-9c78-92be7095d8aa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b80882a6-92da-41ca-9d90-fb1350305502" xlink:to="loc_us-gaap_AwardTypeAxis_8744591c-f19d-4297-9c78-92be7095d8aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8744591c-f19d-4297-9c78-92be7095d8aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_8744591c-f19d-4297-9c78-92be7095d8aa" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8744591c-f19d-4297-9c78-92be7095d8aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_aebb4d51-e948-4d9b-b034-cc5ae0a95af5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_8744591c-f19d-4297-9c78-92be7095d8aa" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_aebb4d51-e948-4d9b-b034-cc5ae0a95af5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_d69752ad-5d9b-4834-b44b-086d2e859fdb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_aebb4d51-e948-4d9b-b034-cc5ae0a95af5" xlink:to="loc_us-gaap_EmployeeStockOptionMember_d69752ad-5d9b-4834-b44b-086d2e859fdb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_5f198374-b0a3-4cb9-a98a-1419bbcdeff2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_aebb4d51-e948-4d9b-b034-cc5ae0a95af5" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_5f198374-b0a3-4cb9-a98a-1419bbcdeff2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_80216db5-2190-4470-b0a0-db4a69b3bef1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_aebb4d51-e948-4d9b-b034-cc5ae0a95af5" xlink:to="loc_us-gaap_PerformanceSharesMember_80216db5-2190-4470-b0a0-db4a69b3bef1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_7cfce860-f633-499f-9eed-6ddf369893fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_aebb4d51-e948-4d9b-b034-cc5ae0a95af5" xlink:to="loc_us-gaap_EmployeeStockMember_7cfce860-f633-499f-9eed-6ddf369893fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_61b74bd8-7c7a-4ba7-9d6e-430613134cea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_61b74bd8-7c7a-4ba7-9d6e-430613134cea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_2ea2d368-96ce-4de5-b2a4-42e062e6a861" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_2ea2d368-96ce-4de5-b2a4-42e062e6a861" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_2f7b4ff4-f0f4-4c48-a1f8-487dc57c09ef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_2f7b4ff4-f0f4-4c48-a1f8-487dc57c09ef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_881d754a-5cb8-4145-b963-843550080ff0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_881d754a-5cb8-4145-b963-843550080ff0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_e6404716-7a3e-4435-8514-bd9366bb5b9e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_e6404716-7a3e-4435-8514-bd9366bb5b9e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfContinuousDaysOfService_66f35e16-2d7d-45d7-ba7e-ebb179d914c7" xlink:href="dgii-20240331.xsd#dgii_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfContinuousDaysOfService"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_dgii_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfContinuousDaysOfService_66f35e16-2d7d-45d7-ba7e-ebb179d914c7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfHoursPerWeekEmployed_f5753ee5-71ff-442a-a8b4-9e3544d7a549" xlink:href="dgii-20240331.xsd#dgii_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfHoursPerWeekEmployed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_dgii_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfHoursPerWeekEmployed_f5753ee5-71ff-442a-a8b4-9e3544d7a549" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_2631abd8-a682-4ae6-85b5-c46fb0ddddff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_2631abd8-a682-4ae6-85b5-c46fb0ddddff" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_220c7309-9798-45b2-87fc-80b177e8a7fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_220c7309-9798-45b2-87fc-80b177e8a7fa" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dgii_ShareBasedCompensationEmployeeStockPurchasePlanSharesAvailableForFuturePurchase_614f12da-6d26-46e1-881d-35cf288d88dc" xlink:href="dgii-20240331.xsd#dgii_ShareBasedCompensationEmployeeStockPurchasePlanSharesAvailableForFuturePurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_dgii_ShareBasedCompensationEmployeeStockPurchasePlanSharesAvailableForFuturePurchase_614f12da-6d26-46e1-881d-35cf288d88dc" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_69263183-c04e-4ee4-b181-f0d15ae3e26d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_69263183-c04e-4ee4-b181-f0d15ae3e26d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_0e0e3300-5358-4572-890b-243d8241f74f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_0e0e3300-5358-4572-890b-243d8241f74f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_23f4db47-4f5c-4b16-8f4d-86324ab7489a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_23f4db47-4f5c-4b16-8f4d-86324ab7489a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_1ce5fd0a-671b-4069-a56c-9a6acc52a270" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_1ce5fd0a-671b-4069-a56c-9a6acc52a270" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockPlans_9588a9ad-b064-4a3c-9ae0-db42f9dfd2ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromStockPlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_09fb9589-079f-46d1-beab-ca7a20774f1f" xlink:to="loc_us-gaap_ProceedsFromStockPlans_9588a9ad-b064-4a3c-9ae0-db42f9dfd2ce" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#StockBasedCompensationStockBasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_7d6699dd-d029-4b66-a07d-532e25baf355" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_9dd15d32-c6e5-4e0a-b174-2eec1b5d1e3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_7d6699dd-d029-4b66-a07d-532e25baf355" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_9dd15d32-c6e5-4e0a-b174-2eec1b5d1e3e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_99545b5a-b003-43aa-ad59-f8187ad697ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_9dd15d32-c6e5-4e0a-b174-2eec1b5d1e3e" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_99545b5a-b003-43aa-ad59-f8187ad697ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_99545b5a-b003-43aa-ad59-f8187ad697ac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_99545b5a-b003-43aa-ad59-f8187ad697ac" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_99545b5a-b003-43aa-ad59-f8187ad697ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_92aa4bc6-87b8-4bbc-a4db-6bdf1f1156ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_99545b5a-b003-43aa-ad59-f8187ad697ac" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_92aa4bc6-87b8-4bbc-a4db-6bdf1f1156ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_56e59884-fe7c-428c-a466-4e51ca858396" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_92aa4bc6-87b8-4bbc-a4db-6bdf1f1156ac" xlink:to="loc_us-gaap_CostOfSalesMember_56e59884-fe7c-428c-a466-4e51ca858396" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_f76edf9c-8a40-4ab9-9740-5ed8e2e191aa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_92aa4bc6-87b8-4bbc-a4db-6bdf1f1156ac" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_f76edf9c-8a40-4ab9-9740-5ed8e2e191aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_dc4860e6-393e-43e3-90be-03b5cfb67be7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_92aa4bc6-87b8-4bbc-a4db-6bdf1f1156ac" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_dc4860e6-393e-43e3-90be-03b5cfb67be7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_031dfe7a-91f9-4f74-a9be-7d9542482dbd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_92aa4bc6-87b8-4bbc-a4db-6bdf1f1156ac" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_031dfe7a-91f9-4f74-a9be-7d9542482dbd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_6ec32f44-67eb-40c1-a5ea-790b55fd40ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_7d6699dd-d029-4b66-a07d-532e25baf355" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_6ec32f44-67eb-40c1-a5ea-790b55fd40ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_72215e3d-e1d2-4ed6-a616-eca3c2cd6852" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_7d6699dd-d029-4b66-a07d-532e25baf355" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_72215e3d-e1d2-4ed6-a616-eca3c2cd6852" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_c87b9c92-0892-42c8-83d7-a13bebc328d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_7d6699dd-d029-4b66-a07d-532e25baf355" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_c87b9c92-0892-42c8-83d7-a13bebc328d9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/StockBasedCompensationOptionsandCommonSharesReservedforGrantDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#StockBasedCompensationOptionsandCommonSharesReservedforGrantDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/StockBasedCompensationOptionsandCommonSharesReservedforGrantDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e2ddf36b-7be4-42a5-9542-05aa872a291a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7aadd691-f34b-4bf4-84d1-d8647a36c0e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e2ddf36b-7be4-42a5-9542-05aa872a291a" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7aadd691-f34b-4bf4-84d1-d8647a36c0e2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_afda9331-fe74-4c3a-a48f-c6167c2bc90e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7aadd691-f34b-4bf4-84d1-d8647a36c0e2" xlink:to="loc_us-gaap_AwardTypeAxis_afda9331-fe74-4c3a-a48f-c6167c2bc90e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_afda9331-fe74-4c3a-a48f-c6167c2bc90e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_afda9331-fe74-4c3a-a48f-c6167c2bc90e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_afda9331-fe74-4c3a-a48f-c6167c2bc90e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_12425b09-a366-4828-9dc6-e1c6f7651247" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_afda9331-fe74-4c3a-a48f-c6167c2bc90e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_12425b09-a366-4828-9dc6-e1c6f7651247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_2b45af46-cbb6-492b-96bc-2c0226c7cbd1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_12425b09-a366-4828-9dc6-e1c6f7651247" xlink:to="loc_us-gaap_EmployeeStockOptionMember_2b45af46-cbb6-492b-96bc-2c0226c7cbd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_deb6fc84-c978-48ee-a765-5fba8e66d5a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e2ddf36b-7be4-42a5-9542-05aa872a291a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_deb6fc84-c978-48ee-a765-5fba8e66d5a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_f7b0caff-35eb-4c7d-8e98-673806ad8c0a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_deb6fc84-c978-48ee-a765-5fba8e66d5a3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_f7b0caff-35eb-4c7d-8e98-673806ad8c0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_4c303b73-32c5-4999-bdd4-a478cd781877" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_deb6fc84-c978-48ee-a765-5fba8e66d5a3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_4c303b73-32c5-4999-bdd4-a478cd781877" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_bc65ab16-b23e-4d88-a679-7d87dd2a5661" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_deb6fc84-c978-48ee-a765-5fba8e66d5a3" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_bc65ab16-b23e-4d88-a679-7d87dd2a5661" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_c3c9fbc1-5bc9-4279-8eee-7741b78f9164" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_deb6fc84-c978-48ee-a765-5fba8e66d5a3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_c3c9fbc1-5bc9-4279-8eee-7741b78f9164" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_f768b9eb-066f-4646-a292-c4393d6e34c6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_280ee573-37fc-4d98-a30a-5af7272a2d3c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_deb6fc84-c978-48ee-a765-5fba8e66d5a3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_280ee573-37fc-4d98-a30a-5af7272a2d3c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7194ff1d-0e4c-48b8-8d7d-3f5226b5893a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e2ddf36b-7be4-42a5-9542-05aa872a291a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7194ff1d-0e4c-48b8-8d7d-3f5226b5893a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_69aaa8c5-888f-4f03-9cc9-1baac1379afa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7194ff1d-0e4c-48b8-8d7d-3f5226b5893a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_69aaa8c5-888f-4f03-9cc9-1baac1379afa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_b23ac147-896c-41f8-86ec-ee84aa7062af" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7194ff1d-0e4c-48b8-8d7d-3f5226b5893a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_b23ac147-896c-41f8-86ec-ee84aa7062af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_42c01b01-f5b6-4beb-a809-60eb3408d7b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7194ff1d-0e4c-48b8-8d7d-3f5226b5893a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_42c01b01-f5b6-4beb-a809-60eb3408d7b9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_d1cacbea-875e-40a8-b8cb-a4965975ea07" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7194ff1d-0e4c-48b8-8d7d-3f5226b5893a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_d1cacbea-875e-40a8-b8cb-a4965975ea07" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_7ba447ba-7852-4b52-aee0-a3a3be43f5b7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_71a23852-5740-488c-bce2-7e84955c6e94" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7194ff1d-0e4c-48b8-8d7d-3f5226b5893a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_71a23852-5740-488c-bce2-7e84955c6e94" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7964cc5a-58e1-4099-b8b5-d2aad19413fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e2ddf36b-7be4-42a5-9542-05aa872a291a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7964cc5a-58e1-4099-b8b5-d2aad19413fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_4ef3e0ff-f068-40f7-9a56-6b93c3f6402d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7964cc5a-58e1-4099-b8b5-d2aad19413fa" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_4ef3e0ff-f068-40f7-9a56-6b93c3f6402d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_afbd9017-8ff9-43be-9e23-12fa1eb3589b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7964cc5a-58e1-4099-b8b5-d2aad19413fa" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_afbd9017-8ff9-43be-9e23-12fa1eb3589b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_6623f91a-5874-49a8-a134-69b6850fba3c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7964cc5a-58e1-4099-b8b5-d2aad19413fa" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_6623f91a-5874-49a8-a134-69b6850fba3c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_d4a88d16-9f35-4c2c-b2b0-062fe91c01d2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7964cc5a-58e1-4099-b8b5-d2aad19413fa" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_d4a88d16-9f35-4c2c-b2b0-062fe91c01d2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_ea4dcc69-3bff-4e59-87fd-da1aed10cbbd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e2ddf36b-7be4-42a5-9542-05aa872a291a" xlink:to="loc_us-gaap_SharePrice_ea4dcc69-3bff-4e59-87fd-da1aed10cbbd" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/StockBasedCompensationFairValueAssumptionsDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#StockBasedCompensationFairValueAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/StockBasedCompensationFairValueAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4322feb-609c-42c8-9ae0-f8970c95b4a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_409a3361-169a-41da-8b5d-51e8dc450af5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4322feb-609c-42c8-9ae0-f8970c95b4a7" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_409a3361-169a-41da-8b5d-51e8dc450af5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_3347dd2b-a610-449c-b9e9-d66d68ce33f7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_409a3361-169a-41da-8b5d-51e8dc450af5" xlink:to="loc_us-gaap_AwardTypeAxis_3347dd2b-a610-449c-b9e9-d66d68ce33f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3347dd2b-a610-449c-b9e9-d66d68ce33f7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_3347dd2b-a610-449c-b9e9-d66d68ce33f7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3347dd2b-a610-449c-b9e9-d66d68ce33f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_602a851b-1f83-4ee2-954f-97b97ac11867" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_3347dd2b-a610-449c-b9e9-d66d68ce33f7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_602a851b-1f83-4ee2-954f-97b97ac11867" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_1e42edb1-0ed8-4069-9c1d-146e24c3354a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_602a851b-1f83-4ee2-954f-97b97ac11867" xlink:to="loc_us-gaap_EmployeeStockOptionMember_1e42edb1-0ed8-4069-9c1d-146e24c3354a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_00d23997-f5a9-42f8-a101-5de7ec0e7128" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_409a3361-169a-41da-8b5d-51e8dc450af5" xlink:to="loc_srt_RangeAxis_00d23997-f5a9-42f8-a101-5de7ec0e7128" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_00d23997-f5a9-42f8-a101-5de7ec0e7128_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_00d23997-f5a9-42f8-a101-5de7ec0e7128" xlink:to="loc_srt_RangeMember_00d23997-f5a9-42f8-a101-5de7ec0e7128_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_924402ce-e6a9-46fa-9952-32d9931b7e49" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_00d23997-f5a9-42f8-a101-5de7ec0e7128" xlink:to="loc_srt_RangeMember_924402ce-e6a9-46fa-9952-32d9931b7e49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_d2c1deb4-b6ca-423d-be71-0eb6cc7210e0" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_924402ce-e6a9-46fa-9952-32d9931b7e49" xlink:to="loc_srt_MinimumMember_d2c1deb4-b6ca-423d-be71-0eb6cc7210e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_d75ef39c-abc2-4b70-a621-ed48e2ab7b21" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_924402ce-e6a9-46fa-9952-32d9931b7e49" xlink:to="loc_srt_MaximumMember_d75ef39c-abc2-4b70-a621-ed48e2ab7b21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_0b7661b1-fae5-49fe-8a8e-9c865cb490ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4322feb-609c-42c8-9ae0-f8970c95b4a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_0b7661b1-fae5-49fe-8a8e-9c865cb490ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_b409b2e6-5829-49b0-9036-1dc2d6bd8fc3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4322feb-609c-42c8-9ae0-f8970c95b4a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_b409b2e6-5829-49b0-9036-1dc2d6bd8fc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_75476d38-b236-4cd8-ae40-ecb6a4b6591e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_b409b2e6-5829-49b0-9036-1dc2d6bd8fc3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_75476d38-b236-4cd8-ae40-ecb6a4b6591e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_3dfa4986-5e11-4ec3-b4da-6a7a8b021831" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_b409b2e6-5829-49b0-9036-1dc2d6bd8fc3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_3dfa4986-5e11-4ec3-b4da-6a7a8b021831" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_67b47d72-8a44-4f05-9ed4-19e3e2e732cb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_b409b2e6-5829-49b0-9036-1dc2d6bd8fc3" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_67b47d72-8a44-4f05-9ed4-19e3e2e732cb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_aed6f479-798b-4336-84ce-38476dd14657" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_b409b2e6-5829-49b0-9036-1dc2d6bd8fc3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_aed6f479-798b-4336-84ce-38476dd14657" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_0650b52e-ffbe-461e-bc2e-99435bf68c44" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_b409b2e6-5829-49b0-9036-1dc2d6bd8fc3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_0650b52e-ffbe-461e-bc2e-99435bf68c44" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_af799c96-3db3-48fa-877a-c7ab3f25a280" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_b409b2e6-5829-49b0-9036-1dc2d6bd8fc3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_af799c96-3db3-48fa-877a-c7ab3f25a280" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.digi.com/role/StockBasedCompensationNonVestedOptionsDetails" xlink:type="simple" xlink:href="dgii-20240331.xsd#StockBasedCompensationNonVestedOptionsDetails"/>
  <link:definitionLink xlink:role="http://www.digi.com/role/StockBasedCompensationNonVestedOptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e1a5056f-8bdc-4536-9ba9-13b44925c7a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4512ea79-bc19-4d21-9b4c-6c7f918ba8c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e1a5056f-8bdc-4536-9ba9-13b44925c7a1" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4512ea79-bc19-4d21-9b4c-6c7f918ba8c2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_15b8c85a-c519-4fd1-bfd4-25a70a0b7372" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4512ea79-bc19-4d21-9b4c-6c7f918ba8c2" xlink:to="loc_us-gaap_AwardTypeAxis_15b8c85a-c519-4fd1-bfd4-25a70a0b7372" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_15b8c85a-c519-4fd1-bfd4-25a70a0b7372_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_15b8c85a-c519-4fd1-bfd4-25a70a0b7372" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_15b8c85a-c519-4fd1-bfd4-25a70a0b7372_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82972518-ca9c-4e41-846d-0ca14351ec6b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_15b8c85a-c519-4fd1-bfd4-25a70a0b7372" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82972518-ca9c-4e41-846d-0ca14351ec6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_111130c7-9481-4ee8-8da0-720c83ddaf42" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82972518-ca9c-4e41-846d-0ca14351ec6b" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_111130c7-9481-4ee8-8da0-720c83ddaf42" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_6ce5ad75-0dd9-4df9-9644-44a936069a6d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82972518-ca9c-4e41-846d-0ca14351ec6b" xlink:to="loc_us-gaap_PerformanceSharesMember_6ce5ad75-0dd9-4df9-9644-44a936069a6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea37362e-3cbd-485a-b917-d6d49e96ca85" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e1a5056f-8bdc-4536-9ba9-13b44925c7a1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea37362e-3cbd-485a-b917-d6d49e96ca85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_eb80d118-3f98-430b-b638-9e888c8fc040" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea37362e-3cbd-485a-b917-d6d49e96ca85" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_eb80d118-3f98-430b-b638-9e888c8fc040" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_16c33da8-ee10-4893-aba5-38769594c110" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea37362e-3cbd-485a-b917-d6d49e96ca85" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_16c33da8-ee10-4893-aba5-38769594c110" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_4c7f87d5-71b7-4efb-8566-024f67a4948e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea37362e-3cbd-485a-b917-d6d49e96ca85" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_4c7f87d5-71b7-4efb-8566-024f67a4948e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_3149813d-0f87-4841-bcc8-4a32c1cdb2df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea37362e-3cbd-485a-b917-d6d49e96ca85" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_3149813d-0f87-4841-bcc8-4a32c1cdb2df" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_ac9d7dab-83c4-4235-a26b-0c2d9454c17f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_fe227f37-292f-4c37-b18b-c6d91041dc93" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e1a5056f-8bdc-4536-9ba9-13b44925c7a1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_fe227f37-292f-4c37-b18b-c6d91041dc93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_bc14ad25-a5e7-41e9-868f-bd311ea7536e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_fe227f37-292f-4c37-b18b-c6d91041dc93" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_bc14ad25-a5e7-41e9-868f-bd311ea7536e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_04950e68-7144-475b-952d-f6a32414d7fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_fe227f37-292f-4c37-b18b-c6d91041dc93" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_04950e68-7144-475b-952d-f6a32414d7fb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_15579c48-d4fa-4a99-926b-2ab8d4cda01e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_fe227f37-292f-4c37-b18b-c6d91041dc93" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_15579c48-d4fa-4a99-926b-2ab8d4cda01e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_62fe3362-0337-477f-8ebf-14e3ecf4d00e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_fe227f37-292f-4c37-b18b-c6d91041dc93" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_62fe3362-0337-477f-8ebf-14e3ecf4d00e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_b0337beb-a2ba-4c68-ba25-a4b46fcd410d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#AwardTypeOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_EmployeeStockMember" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_PerformanceSharesMember" xlink:type="arc" order="6"/>
  </link:definitionLink>
</link:linkbase>
