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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:57721f22-e2df-4684-8534-d4f9bee1d8f2,g:3c928103-ee48-4c0e-b077-1b0c72f55f97-->
<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.embecta.com/role/CondensedConsolidatedStatementsofEquity" xlink:type="simple" xlink:href="embc-20241231.xsd#CondensedConsolidatedStatementsofEquity"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/CondensedConsolidatedStatementsofEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_09fdb10a-f93a-4b7e-83f1-f5dd761f6f5b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_32e07bbc-9b35-4783-8fca-67d8360f3717" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_09fdb10a-f93a-4b7e-83f1-f5dd761f6f5b" xlink:to="loc_us-gaap_StatementTable_32e07bbc-9b35-4783-8fca-67d8360f3717" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_58f59da7-949d-44ef-855c-e6a2e388af27" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_32e07bbc-9b35-4783-8fca-67d8360f3717" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_58f59da7-949d-44ef-855c-e6a2e388af27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_58f59da7-949d-44ef-855c-e6a2e388af27_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_58f59da7-949d-44ef-855c-e6a2e388af27" xlink:to="loc_us-gaap_EquityComponentDomain_58f59da7-949d-44ef-855c-e6a2e388af27_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_2065c35e-4152-4446-8bc5-54465b76e6a7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_58f59da7-949d-44ef-855c-e6a2e388af27" xlink:to="loc_us-gaap_EquityComponentDomain_2065c35e-4152-4446-8bc5-54465b76e6a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_ae00a84b-acb1-4439-8d98-c83947ba2c02" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2065c35e-4152-4446-8bc5-54465b76e6a7" xlink:to="loc_us-gaap_CommonStockMember_ae00a84b-acb1-4439-8d98-c83947ba2c02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_98a2920e-8c3b-40ec-9da3-aa0e4f5848bb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2065c35e-4152-4446-8bc5-54465b76e6a7" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_98a2920e-8c3b-40ec-9da3-aa0e4f5848bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_e02ae496-d537-4fd2-a8e4-7d8e880c0eb8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2065c35e-4152-4446-8bc5-54465b76e6a7" xlink:to="loc_us-gaap_RetainedEarningsMember_e02ae496-d537-4fd2-a8e4-7d8e880c0eb8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_a569e9ea-a473-44d6-ae24-f99d508579c3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2065c35e-4152-4446-8bc5-54465b76e6a7" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_a569e9ea-a473-44d6-ae24-f99d508579c3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c78d7055-86b6-4b16-9619-2ab873709071" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_09fdb10a-f93a-4b7e-83f1-f5dd761f6f5b" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c78d7055-86b6-4b16-9619-2ab873709071" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_881ed51b-28a4-48c4-ae63-fb16795b25c0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c78d7055-86b6-4b16-9619-2ab873709071" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_881ed51b-28a4-48c4-ae63-fb16795b25c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_1e12d8da-a04d-40b5-922e-f82e37b4d358" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c78d7055-86b6-4b16-9619-2ab873709071" xlink:to="loc_us-gaap_StockholdersEquity_1e12d8da-a04d-40b5-922e-f82e37b4d358" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_4898a63e-d40c-40c9-8f21-8e5ae6446a83" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c78d7055-86b6-4b16-9619-2ab873709071" xlink:to="loc_us-gaap_NetIncomeLoss_4898a63e-d40c-40c9-8f21-8e5ae6446a83" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_5fb1c652-ef7c-44de-9327-3d914313dae3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c78d7055-86b6-4b16-9619-2ab873709071" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_5fb1c652-ef7c-44de-9327-3d914313dae3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_7cc28752-23f3-4df6-9ce5-066ccf88294e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c78d7055-86b6-4b16-9619-2ab873709071" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_7cc28752-23f3-4df6-9ce5-066ccf88294e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_3eea954e-8468-4b1e-9a44-56d7f93de4fb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c78d7055-86b6-4b16-9619-2ab873709071" xlink:to="loc_us-gaap_DividendsCommonStock_3eea954e-8468-4b1e-9a44-56d7f93de4fb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_c2055f13-88c9-4194-94aa-610986edf60a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c78d7055-86b6-4b16-9619-2ab873709071" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_c2055f13-88c9-4194-94aa-610986edf60a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_cfe2bc0a-b0b4-4d5d-88ad-eba2dc9db8e8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c78d7055-86b6-4b16-9619-2ab873709071" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_cfe2bc0a-b0b4-4d5d-88ad-eba2dc9db8e8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_e3dded13-face-4578-82fb-1f891bc80c73" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_451d8b77-b9ec-47c8-aa51-8ca6545e7b02" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/ThirdPartyArrangementsandRelatedPartyDisclosuresDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#ThirdPartyArrangementsandRelatedPartyDisclosuresDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/ThirdPartyArrangementsandRelatedPartyDisclosuresDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_ff4d437e-2e30-4bff-83b2-d3596690fa44" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_6d12f7b1-51e9-4573-bf76-47e121c0cb95" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_ff4d437e-2e30-4bff-83b2-d3596690fa44" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_6d12f7b1-51e9-4573-bf76-47e121c0cb95" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_c45ffb56-0a58-481e-9487-a4daa6c5acd4" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_6d12f7b1-51e9-4573-bf76-47e121c0cb95" xlink:to="loc_srt_CounterpartyNameAxis_c45ffb56-0a58-481e-9487-a4daa6c5acd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_c45ffb56-0a58-481e-9487-a4daa6c5acd4_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_c45ffb56-0a58-481e-9487-a4daa6c5acd4" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_c45ffb56-0a58-481e-9487-a4daa6c5acd4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_4b05c599-55dd-41dc-ad90-871e920bc562" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_c45ffb56-0a58-481e-9487-a4daa6c5acd4" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_4b05c599-55dd-41dc-ad90-871e920bc562" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_BectonDickinsonAndCompanyMember_d6fa7354-b14d-44cd-a95e-8303e54b1e4e" xlink:href="embc-20241231.xsd#embc_BectonDickinsonAndCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_4b05c599-55dd-41dc-ad90-871e920bc562" xlink:to="loc_embc_BectonDickinsonAndCompanyMember_d6fa7354-b14d-44cd-a95e-8303e54b1e4e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_7184b5c2-71b4-4188-bdd0-92d6d051a302" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_ff4d437e-2e30-4bff-83b2-d3596690fa44" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_7184b5c2-71b4-4188-bdd0-92d6d051a302" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableOtherCurrent_1ca4cbc1-e912-4268-931c-6459b996f8d0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsPayableOtherCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_ff4d437e-2e30-4bff-83b2-d3596690fa44" xlink:to="loc_us-gaap_AccountsPayableOtherCurrent_1ca4cbc1-e912-4268-931c-6459b996f8d0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/BusinessRestructuringChargesDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#BusinessRestructuringChargesDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/BusinessRestructuringChargesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_95d17a2c-0dbe-435b-84fd-08904ddd9372" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3f91cd89-8420-494f-8ba9-d9f6720cb678" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_95d17a2c-0dbe-435b-84fd-08904ddd9372" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3f91cd89-8420-494f-8ba9-d9f6720cb678" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_79d91ff7-8f65-47d3-9392-fd2017b9cea6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3f91cd89-8420-494f-8ba9-d9f6720cb678" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_79d91ff7-8f65-47d3-9392-fd2017b9cea6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_79d91ff7-8f65-47d3-9392-fd2017b9cea6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_79d91ff7-8f65-47d3-9392-fd2017b9cea6" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_79d91ff7-8f65-47d3-9392-fd2017b9cea6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_20037aa6-078e-4eb7-8255-803b38797649" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_79d91ff7-8f65-47d3-9392-fd2017b9cea6" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_20037aa6-078e-4eb7-8255-803b38797649" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_a65043d3-b612-4002-93bb-6aff4f0272f7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_20037aa6-078e-4eb7-8255-803b38797649" xlink:to="loc_us-gaap_EmployeeSeveranceMember_a65043d3-b612-4002-93bb-6aff4f0272f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_54b9a109-0158-4932-82fb-5e78420786bc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_20037aa6-078e-4eb7-8255-803b38797649" xlink:to="loc_us-gaap_OtherRestructuringMember_54b9a109-0158-4932-82fb-5e78420786bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_ec0a4a07-cab9-4cbe-af02-448ba5a4bf62" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3f91cd89-8420-494f-8ba9-d9f6720cb678" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_ec0a4a07-cab9-4cbe-af02-448ba5a4bf62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_ec0a4a07-cab9-4cbe-af02-448ba5a4bf62_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_ec0a4a07-cab9-4cbe-af02-448ba5a4bf62" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_ec0a4a07-cab9-4cbe-af02-448ba5a4bf62_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_05d77a10-7352-43aa-8ebc-6935d587ae42" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_ec0a4a07-cab9-4cbe-af02-448ba5a4bf62" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_05d77a10-7352-43aa-8ebc-6935d587ae42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseMember_fd612c33-9ad3-4e51-9907-d5dba1bb9b66" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherOperatingIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_05d77a10-7352-43aa-8ebc-6935d587ae42" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseMember_fd612c33-9ad3-4e51-9907-d5dba1bb9b66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_974bd791-c354-47fe-844a-ed64892cf398" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_05d77a10-7352-43aa-8ebc-6935d587ae42" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_974bd791-c354-47fe-844a-ed64892cf398" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_b5d38b32-c255-4dbf-87ef-5a98e69b7f2f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_05d77a10-7352-43aa-8ebc-6935d587ae42" xlink:to="loc_us-gaap_CostOfSalesMember_b5d38b32-c255-4dbf-87ef-5a98e69b7f2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_8cce4f83-55d1-4942-92bd-ce18af7b94de" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_05d77a10-7352-43aa-8ebc-6935d587ae42" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_8cce4f83-55d1-4942-92bd-ce18af7b94de" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_c4fb20ec-cae8-4356-9681-86193dd7cd2d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3f91cd89-8420-494f-8ba9-d9f6720cb678" xlink:to="loc_srt_RangeAxis_c4fb20ec-cae8-4356-9681-86193dd7cd2d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c4fb20ec-cae8-4356-9681-86193dd7cd2d_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_c4fb20ec-cae8-4356-9681-86193dd7cd2d" xlink:to="loc_srt_RangeMember_c4fb20ec-cae8-4356-9681-86193dd7cd2d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1728e0ff-8f39-4f97-a4aa-ceaa07b92170" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_c4fb20ec-cae8-4356-9681-86193dd7cd2d" xlink:to="loc_srt_RangeMember_1728e0ff-8f39-4f97-a4aa-ceaa07b92170" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_c9b81fd6-f6e2-423e-bdf1-e7a2c90d2d2a" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1728e0ff-8f39-4f97-a4aa-ceaa07b92170" xlink:to="loc_srt_MinimumMember_c9b81fd6-f6e2-423e-bdf1-e7a2c90d2d2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_ae5740ec-d5d9-4a14-a86e-e71b6d9c0373" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1728e0ff-8f39-4f97-a4aa-ceaa07b92170" xlink:to="loc_srt_MaximumMember_ae5740ec-d5d9-4a14-a86e-e71b6d9c0373" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_b167ac18-57ed-4bd5-90f2-4f62682cc372" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3f91cd89-8420-494f-8ba9-d9f6720cb678" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_b167ac18-57ed-4bd5-90f2-4f62682cc372" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_b167ac18-57ed-4bd5-90f2-4f62682cc372_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_b167ac18-57ed-4bd5-90f2-4f62682cc372" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_b167ac18-57ed-4bd5-90f2-4f62682cc372_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_a979f18a-2840-488e-bb28-e78fed54eb0f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_b167ac18-57ed-4bd5-90f2-4f62682cc372" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_a979f18a-2840-488e-bb28-e78fed54eb0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_SalariesWagesAndRelatedItemsMember_01967b02-96e6-4a75-b1cb-d5758f0e0935" xlink:href="embc-20241231.xsd#embc_SalariesWagesAndRelatedItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_a979f18a-2840-488e-bb28-e78fed54eb0f" xlink:to="loc_embc_SalariesWagesAndRelatedItemsMember_01967b02-96e6-4a75-b1cb-d5758f0e0935" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesMember_58bf9733-338f-4afb-8ef1-4ac81d144320" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccruedLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_a979f18a-2840-488e-bb28-e78fed54eb0f" xlink:to="loc_us-gaap_AccruedLiabilitiesMember_58bf9733-338f-4afb-8ef1-4ac81d144320" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_caae51be-61e6-48fd-86c2-5bf1aa91e042" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_95d17a2c-0dbe-435b-84fd-08904ddd9372" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_caae51be-61e6-48fd-86c2-5bf1aa91e042" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_d7a4d43b-cbcb-4003-9b23-fc48faa4f906" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_95d17a2c-0dbe-435b-84fd-08904ddd9372" xlink:to="loc_us-gaap_RestructuringReserveRollForward_d7a4d43b-cbcb-4003-9b23-fc48faa4f906" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_ad92e360-54d5-4693-b149-2edf7e227797" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_d7a4d43b-cbcb-4003-9b23-fc48faa4f906" xlink:to="loc_us-gaap_RestructuringReserve_ad92e360-54d5-4693-b149-2edf7e227797" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_9e6c880e-0105-4f67-83ca-3664e46466ed" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_d7a4d43b-cbcb-4003-9b23-fc48faa4f906" xlink:to="loc_us-gaap_RestructuringCharges_9e6c880e-0105-4f67-83ca-3664e46466ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_2f37b663-d18e-44a9-8801-52f772af7032" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_d7a4d43b-cbcb-4003-9b23-fc48faa4f906" xlink:to="loc_us-gaap_PaymentsForRestructuring_2f37b663-d18e-44a9-8801-52f772af7032" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveAccrualAdjustment1_30433dd0-9fc0-49da-a6e2-7184afa1d0cd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserveAccrualAdjustment1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_d7a4d43b-cbcb-4003-9b23-fc48faa4f906" xlink:to="loc_us-gaap_RestructuringReserveAccrualAdjustment1_30433dd0-9fc0-49da-a6e2-7184afa1d0cd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_e2efd9e9-7bae-42ae-be25-f7d39aa1e751" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserve"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_ea0f5e9c-00ab-4552-8923-cb54d53b5aee" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCharges"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_ce0367fb-59d8-435e-a501-8424e19d684d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserve"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/SegmentandGeographicalDataScheduleofRevenuesbyGeographicalRegionDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#SegmentandGeographicalDataScheduleofRevenuesbyGeographicalRegionDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/SegmentandGeographicalDataScheduleofRevenuesbyGeographicalRegionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_daea1405-1c56-40a5-b430-ee7047691248" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_33215735-594f-4fbb-b434-b33012d17248" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_daea1405-1c56-40a5-b430-ee7047691248" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_33215735-594f-4fbb-b434-b33012d17248" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_d9f5b7a1-6205-4904-bb28-fda4dc0c9b7d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_33215735-594f-4fbb-b434-b33012d17248" xlink:to="loc_srt_StatementGeographicalAxis_d9f5b7a1-6205-4904-bb28-fda4dc0c9b7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_d9f5b7a1-6205-4904-bb28-fda4dc0c9b7d_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_d9f5b7a1-6205-4904-bb28-fda4dc0c9b7d" xlink:to="loc_srt_SegmentGeographicalDomain_d9f5b7a1-6205-4904-bb28-fda4dc0c9b7d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_6c970883-fad9-4889-a752-5c9840daf0b3" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_d9f5b7a1-6205-4904-bb28-fda4dc0c9b7d" xlink:to="loc_srt_SegmentGeographicalDomain_6c970883-fad9-4889-a752-5c9840daf0b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_3054ca36-ca7e-48eb-9169-0eea1b743df8" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_6c970883-fad9-4889-a752-5c9840daf0b3" xlink:to="loc_country_US_3054ca36-ca7e-48eb-9169-0eea1b743df8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_9bc00665-71ac-478b-aff5-3c582f09d442" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_6c970883-fad9-4889-a752-5c9840daf0b3" xlink:to="loc_us-gaap_NonUsMember_9bc00665-71ac-478b-aff5-3c582f09d442" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_b5c1234b-7034-4cd8-a0e3-e94685b8b1f4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_daea1405-1c56-40a5-b430-ee7047691248" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_b5c1234b-7034-4cd8-a0e3-e94685b8b1f4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/SegmentGeographicalDataScheduleofRevenuesbyProductFamilyDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#SegmentGeographicalDataScheduleofRevenuesbyProductFamilyDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/SegmentGeographicalDataScheduleofRevenuesbyProductFamilyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_76b52a0a-9235-46f4-bc51-31b4a8f1200e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_6631fc30-fe6b-4ccc-8fe9-c5009254d49d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_76b52a0a-9235-46f4-bc51-31b4a8f1200e" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_6631fc30-fe6b-4ccc-8fe9-c5009254d49d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_c6979003-5a16-48d4-98b8-8abcfaaa484c" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_6631fc30-fe6b-4ccc-8fe9-c5009254d49d" xlink:to="loc_srt_ProductOrServiceAxis_c6979003-5a16-48d4-98b8-8abcfaaa484c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_c6979003-5a16-48d4-98b8-8abcfaaa484c_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_c6979003-5a16-48d4-98b8-8abcfaaa484c" xlink:to="loc_srt_ProductsAndServicesDomain_c6979003-5a16-48d4-98b8-8abcfaaa484c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_53bc10ed-7dbd-4e75-a12d-438b35b91bac" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_c6979003-5a16-48d4-98b8-8abcfaaa484c" xlink:to="loc_srt_ProductsAndServicesDomain_53bc10ed-7dbd-4e75-a12d-438b35b91bac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_PenNeedlesMember_26f0f8bb-5fdc-4419-a691-0c0cd4a0c330" xlink:href="embc-20241231.xsd#embc_PenNeedlesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_53bc10ed-7dbd-4e75-a12d-438b35b91bac" xlink:to="loc_embc_PenNeedlesMember_26f0f8bb-5fdc-4419-a691-0c0cd4a0c330" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_SyringesMember_da1d04fa-d510-44e4-9584-dcdf7daf0107" xlink:href="embc-20241231.xsd#embc_SyringesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_53bc10ed-7dbd-4e75-a12d-438b35b91bac" xlink:to="loc_embc_SyringesMember_da1d04fa-d510-44e4-9584-dcdf7daf0107" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_SafetyMember_5bb3c129-d8f4-4f1a-a68a-f322c944ef97" xlink:href="embc-20241231.xsd#embc_SafetyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_53bc10ed-7dbd-4e75-a12d-438b35b91bac" xlink:to="loc_embc_SafetyMember_5bb3c129-d8f4-4f1a-a68a-f322c944ef97" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductAndServiceOtherMember_d421e5b8-8cdc-4384-ab4b-32ffcac63549" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProductAndServiceOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_53bc10ed-7dbd-4e75-a12d-438b35b91bac" xlink:to="loc_us-gaap_ProductAndServiceOtherMember_d421e5b8-8cdc-4384-ab4b-32ffcac63549" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManufacturingFacilityMember_4b7144cc-5643-4379-ac8b-100069c1de61" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ManufacturingFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_53bc10ed-7dbd-4e75-a12d-438b35b91bac" xlink:to="loc_us-gaap_ManufacturingFacilityMember_4b7144cc-5643-4379-ac8b-100069c1de61" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_4e781976-2ad3-4cbd-add6-35fb3be7c803" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_76b52a0a-9235-46f4-bc51-31b4a8f1200e" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_4e781976-2ad3-4cbd-add6-35fb3be7c803" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/StockBasedCompensationStockbasedCompensationExpenseDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#StockBasedCompensationStockbasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/StockBasedCompensationStockbasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_678bf53f-99ab-4cde-b1ea-cf94bffa2e76" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_b5ca8256-cdce-4d68-8ab4-07d984eecdf9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_678bf53f-99ab-4cde-b1ea-cf94bffa2e76" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_b5ca8256-cdce-4d68-8ab4-07d984eecdf9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_8177b4af-82b9-43c7-9ea9-c86ebe3728b4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_b5ca8256-cdce-4d68-8ab4-07d984eecdf9" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_8177b4af-82b9-43c7-9ea9-c86ebe3728b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_8177b4af-82b9-43c7-9ea9-c86ebe3728b4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_8177b4af-82b9-43c7-9ea9-c86ebe3728b4" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_8177b4af-82b9-43c7-9ea9-c86ebe3728b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_3dcb76cb-fdc6-4411-9647-7eb3e210af81" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_8177b4af-82b9-43c7-9ea9-c86ebe3728b4" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_3dcb76cb-fdc6-4411-9647-7eb3e210af81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_b037376c-b6aa-4c94-a145-50054a413819" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3dcb76cb-fdc6-4411-9647-7eb3e210af81" xlink:to="loc_us-gaap_CostOfSalesMember_b037376c-b6aa-4c94-a145-50054a413819" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_6f7dcce4-bd34-400f-86d2-918f63977c17" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3dcb76cb-fdc6-4411-9647-7eb3e210af81" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_6f7dcce4-bd34-400f-86d2-918f63977c17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_f311430f-2953-459e-bffd-53f5e5c0d21a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3dcb76cb-fdc6-4411-9647-7eb3e210af81" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_f311430f-2953-459e-bffd-53f5e5c0d21a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseMember_a6af656a-35f9-4ecd-b355-72110d0c55f0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherOperatingIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3dcb76cb-fdc6-4411-9647-7eb3e210af81" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseMember_a6af656a-35f9-4ecd-b355-72110d0c55f0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_3415a24f-b012-4f43-b9c3-c0ab8b672b09" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_b5ca8256-cdce-4d68-8ab4-07d984eecdf9" xlink:to="loc_us-gaap_AwardTypeAxis_3415a24f-b012-4f43-b9c3-c0ab8b672b09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3415a24f-b012-4f43-b9c3-c0ab8b672b09_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_3415a24f-b012-4f43-b9c3-c0ab8b672b09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3415a24f-b012-4f43-b9c3-c0ab8b672b09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f400aef6-b5cc-42d7-9952-4b7bc1828bcb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_3415a24f-b012-4f43-b9c3-c0ab8b672b09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f400aef6-b5cc-42d7-9952-4b7bc1828bcb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockCompensationPlanMember_4df558c9-c8c0-403f-b85e-14e94013f7e8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f400aef6-b5cc-42d7-9952-4b7bc1828bcb" xlink:to="loc_us-gaap_StockCompensationPlanMember_4df558c9-c8c0-403f-b85e-14e94013f7e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedPaymentArrangementLiabilityAwardMember_4bf722d0-ad4d-44f1-ac6f-ab6d1285c785" xlink:href="embc-20241231.xsd#embc_ShareBasedPaymentArrangementLiabilityAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f400aef6-b5cc-42d7-9952-4b7bc1828bcb" xlink:to="loc_embc_ShareBasedPaymentArrangementLiabilityAwardMember_4bf722d0-ad4d-44f1-ac6f-ab6d1285c785" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_TimeVestedRestrictedStockUnitsMember_a5aa7d63-e930-46a3-b888-9c33e5c4f39c" xlink:href="embc-20241231.xsd#embc_TimeVestedRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f400aef6-b5cc-42d7-9952-4b7bc1828bcb" xlink:to="loc_embc_TimeVestedRestrictedStockUnitsMember_a5aa7d63-e930-46a3-b888-9c33e5c4f39c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_PerformanceBasedRestrictedStockUnitsMember_47c429b4-b23b-40bb-9a5f-aad6ce89b32c" xlink:href="embc-20241231.xsd#embc_PerformanceBasedRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f400aef6-b5cc-42d7-9952-4b7bc1828bcb" xlink:to="loc_embc_PerformanceBasedRestrictedStockUnitsMember_47c429b4-b23b-40bb-9a5f-aad6ce89b32c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_e3badb84-05a0-4175-8593-7e5eae9213dd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f400aef6-b5cc-42d7-9952-4b7bc1828bcb" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_e3badb84-05a0-4175-8593-7e5eae9213dd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_726b294a-0398-4105-bf3d-b99938901ba7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_678bf53f-99ab-4cde-b1ea-cf94bffa2e76" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_726b294a-0398-4105-bf3d-b99938901ba7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_a9874b09-32d5-47cc-86dc-5c9a2b72c5cc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_678bf53f-99ab-4cde-b1ea-cf94bffa2e76" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_a9874b09-32d5-47cc-86dc-5c9a2b72c5cc" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#StockBasedCompensationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f34e5868-a75a-4670-9980-096eb396eb59" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_45ea4461-ddbe-4990-9894-a59ebab85b92" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f34e5868-a75a-4670-9980-096eb396eb59" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_45ea4461-ddbe-4990-9894-a59ebab85b92" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_edc0246a-1ab3-401b-814a-33412b0af834" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_45ea4461-ddbe-4990-9894-a59ebab85b92" xlink:to="loc_us-gaap_AwardTypeAxis_edc0246a-1ab3-401b-814a-33412b0af834" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_edc0246a-1ab3-401b-814a-33412b0af834_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_edc0246a-1ab3-401b-814a-33412b0af834" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_edc0246a-1ab3-401b-814a-33412b0af834_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ef31b6f7-46b7-4b2b-8cb4-eccf444ad377" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_edc0246a-1ab3-401b-814a-33412b0af834" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ef31b6f7-46b7-4b2b-8cb4-eccf444ad377" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_TimeVestedRestrictedStockUnitsMember_520baa30-ae89-411f-a1e0-71deba8e2558" xlink:href="embc-20241231.xsd#embc_TimeVestedRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ef31b6f7-46b7-4b2b-8cb4-eccf444ad377" xlink:to="loc_embc_TimeVestedRestrictedStockUnitsMember_520baa30-ae89-411f-a1e0-71deba8e2558" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_PerformanceStockUnitsPSUsMember_0878a516-17d2-4cbf-b29f-da172c078589" xlink:href="embc-20241231.xsd#embc_PerformanceStockUnitsPSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ef31b6f7-46b7-4b2b-8cb4-eccf444ad377" xlink:to="loc_embc_PerformanceStockUnitsPSUsMember_0878a516-17d2-4cbf-b29f-da172c078589" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_4a64cbb2-c65c-4e1f-b985-009cd7af76ec" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ef31b6f7-46b7-4b2b-8cb4-eccf444ad377" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_4a64cbb2-c65c-4e1f-b985-009cd7af76ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_3d8ddb47-e70d-4b4e-b7da-0e6a53f672b5" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_45ea4461-ddbe-4990-9894-a59ebab85b92" xlink:to="loc_srt_TitleOfIndividualAxis_3d8ddb47-e70d-4b4e-b7da-0e6a53f672b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_3d8ddb47-e70d-4b4e-b7da-0e6a53f672b5_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_3d8ddb47-e70d-4b4e-b7da-0e6a53f672b5" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_3d8ddb47-e70d-4b4e-b7da-0e6a53f672b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_6eb7f9e4-230e-4152-a884-89ce129261b2" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_3d8ddb47-e70d-4b4e-b7da-0e6a53f672b5" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_6eb7f9e4-230e-4152-a884-89ce129261b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ExecutiveOfficersAndEmployeesMember_ee3d4af0-40f1-4136-954e-03ba32b99118" xlink:href="embc-20241231.xsd#embc_ExecutiveOfficersAndEmployeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_6eb7f9e4-230e-4152-a884-89ce129261b2" xlink:to="loc_embc_ExecutiveOfficersAndEmployeesMember_ee3d4af0-40f1-4136-954e-03ba32b99118" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_d024d7d1-2ba7-476d-b195-4874fbf2c00e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_45ea4461-ddbe-4990-9894-a59ebab85b92" xlink:to="loc_us-gaap_PlanNameAxis_d024d7d1-2ba7-476d-b195-4874fbf2c00e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_d024d7d1-2ba7-476d-b195-4874fbf2c00e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_d024d7d1-2ba7-476d-b195-4874fbf2c00e" xlink:to="loc_us-gaap_PlanNameDomain_d024d7d1-2ba7-476d-b195-4874fbf2c00e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_e5ffc2a2-b1c8-4370-b0fa-2bdd3223897d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_d024d7d1-2ba7-476d-b195-4874fbf2c00e" xlink:to="loc_us-gaap_PlanNameDomain_e5ffc2a2-b1c8-4370-b0fa-2bdd3223897d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_A2022EmployeeAndDirectorEquityBasedCompensationPlanMember_f0bdf5cc-dd5e-4c65-923c-cebbd1f732cd" xlink:href="embc-20241231.xsd#embc_A2022EmployeeAndDirectorEquityBasedCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_e5ffc2a2-b1c8-4370-b0fa-2bdd3223897d" xlink:to="loc_embc_A2022EmployeeAndDirectorEquityBasedCompensationPlanMember_f0bdf5cc-dd5e-4c65-923c-cebbd1f732cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_be76a6af-41b6-4304-b6f9-d87e2d6e4abe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f34e5868-a75a-4670-9980-096eb396eb59" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_be76a6af-41b6-4304-b6f9-d87e2d6e4abe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_02b52c82-d839-495f-ae1e-ed47509462e7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f34e5868-a75a-4670-9980-096eb396eb59" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_02b52c82-d839-495f-ae1e-ed47509462e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_372f01ca-becb-444c-af81-9ad0c10f37e8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f34e5868-a75a-4670-9980-096eb396eb59" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_372f01ca-becb-444c-af81-9ad0c10f37e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_2c7e3ff3-0b6f-47c8-a2e2-e2f96d9f93fd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f34e5868-a75a-4670-9980-096eb396eb59" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_2c7e3ff3-0b6f-47c8-a2e2-e2f96d9f93fd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_b8020b77-831e-4354-a893-04c0d7547d20" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f34e5868-a75a-4670-9980-096eb396eb59" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_b8020b77-831e-4354-a893-04c0d7547d20" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodExcludingAccumulatedNonvestedDividendEquivalents_3900ac9f-c40b-422a-b0f9-cbf4857c12ef" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodExcludingAccumulatedNonvestedDividendEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f34e5868-a75a-4670-9980-096eb396eb59" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodExcludingAccumulatedNonvestedDividendEquivalents_3900ac9f-c40b-422a-b0f9-cbf4857c12ef" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_8fd448c6-1501-4ded-b11f-ca4b69217cdc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f34e5868-a75a-4670-9980-096eb396eb59" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_8fd448c6-1501-4ded-b11f-ca4b69217cdc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_53f5712a-4e7f-4d40-a363-a1d78ae4b999" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f34e5868-a75a-4670-9980-096eb396eb59" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_53f5712a-4e7f-4d40-a363-a1d78ae4b999" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_85e602a3-6709-4208-866c-1f5c26f22764" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f34e5868-a75a-4670-9980-096eb396eb59" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_85e602a3-6709-4208-866c-1f5c26f22764" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/StockBasedCompensationRestrictedStockUnitsActivityDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#StockBasedCompensationRestrictedStockUnitsActivityDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/StockBasedCompensationRestrictedStockUnitsActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_83c112f6-33b2-4192-83c1-04400190d930" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ceb3b679-778a-468d-b6e9-fb591e17fd1e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_83c112f6-33b2-4192-83c1-04400190d930" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ceb3b679-778a-468d-b6e9-fb591e17fd1e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_fa5f18a3-9fea-4376-a323-48ac4d7fd982" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ceb3b679-778a-468d-b6e9-fb591e17fd1e" xlink:to="loc_us-gaap_AwardTypeAxis_fa5f18a3-9fea-4376-a323-48ac4d7fd982" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fa5f18a3-9fea-4376-a323-48ac4d7fd982_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_fa5f18a3-9fea-4376-a323-48ac4d7fd982" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fa5f18a3-9fea-4376-a323-48ac4d7fd982_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_74109331-9915-4c1f-9576-af083229b306" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_fa5f18a3-9fea-4376-a323-48ac4d7fd982" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_74109331-9915-4c1f-9576-af083229b306" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_TimeVestedRestrictedStockUnitsMember_2133dbdc-e81c-4b37-b9ac-6d4c32ccee0e" xlink:href="embc-20241231.xsd#embc_TimeVestedRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_74109331-9915-4c1f-9576-af083229b306" xlink:to="loc_embc_TimeVestedRestrictedStockUnitsMember_2133dbdc-e81c-4b37-b9ac-6d4c32ccee0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_PerformanceStockUnitsPSUsMember_6a2035e4-5437-4341-a743-97bb0b9bf32f" xlink:href="embc-20241231.xsd#embc_PerformanceStockUnitsPSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_74109331-9915-4c1f-9576-af083229b306" xlink:to="loc_embc_PerformanceStockUnitsPSUsMember_6a2035e4-5437-4341-a743-97bb0b9bf32f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_37e6966c-5a6c-4a76-aa67-91ba47449cd4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_83c112f6-33b2-4192-83c1-04400190d930" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_37e6966c-5a6c-4a76-aa67-91ba47449cd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_930c3694-edc6-40e7-8485-191408fea810" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_37e6966c-5a6c-4a76-aa67-91ba47449cd4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_930c3694-edc6-40e7-8485-191408fea810" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_d094c39f-0b25-4c61-9046-a7f90427f12c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_37e6966c-5a6c-4a76-aa67-91ba47449cd4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_d094c39f-0b25-4c61-9046-a7f90427f12c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_bf2f2909-5647-4d09-90c5-77d38893ce2f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_37e6966c-5a6c-4a76-aa67-91ba47449cd4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_bf2f2909-5647-4d09-90c5-77d38893ce2f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_d77b3866-f8dd-4b86-b09c-0d2676198cf9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_37e6966c-5a6c-4a76-aa67-91ba47449cd4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_d77b3866-f8dd-4b86-b09c-0d2676198cf9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_390459ba-05a5-4720-ab2e-caa7503ed189" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestOutstandingNumber_825ce984-7ad9-47c7-a4a6-54f57aef6451" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_83c112f6-33b2-4192-83c1-04400190d930" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestOutstandingNumber_825ce984-7ad9-47c7-a4a6-54f57aef6451" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_36816872-96c7-4833-a966-ed2231414671" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_83c112f6-33b2-4192-83c1-04400190d930" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_36816872-96c7-4833-a966-ed2231414671" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_bf6dc602-daf0-4e7e-bda7-6fda9b8756fd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_36816872-96c7-4833-a966-ed2231414671" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_bf6dc602-daf0-4e7e-bda7-6fda9b8756fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_9a3227aa-38b3-446a-a369-77f146d29a67" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_36816872-96c7-4833-a966-ed2231414671" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_9a3227aa-38b3-446a-a369-77f146d29a67" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_a6cbb6bb-a960-48de-a8d6-c1eda96cba7e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_36816872-96c7-4833-a966-ed2231414671" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_a6cbb6bb-a960-48de-a8d6-c1eda96cba7e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_83810a70-72f9-4af1-a2cf-4755a7974f09" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_36816872-96c7-4833-a966-ed2231414671" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_83810a70-72f9-4af1-a2cf-4755a7974f09" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_8d934222-c17d-4a87-9839-adc41c7ac960" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue_72e3542b-7af5-4d38-9d5e-953f6b3cff0b" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_83c112f6-33b2-4192-83c1-04400190d930" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue_72e3542b-7af5-4d38-9d5e-953f6b3cff0b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/StockBasedCompensationSARsOutstandingandtheChangesDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#StockBasedCompensationSARsOutstandingandtheChangesDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/StockBasedCompensationSARsOutstandingandtheChangesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6734fcd0-774a-4f2e-81b9-90dddabeeacb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8003e3eb-8151-4e5a-9a32-554af83db734" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6734fcd0-774a-4f2e-81b9-90dddabeeacb" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8003e3eb-8151-4e5a-9a32-554af83db734" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_5692db07-4b8f-4774-ba0b-abe3ecc43652" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8003e3eb-8151-4e5a-9a32-554af83db734" xlink:to="loc_us-gaap_AwardTypeAxis_5692db07-4b8f-4774-ba0b-abe3ecc43652" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5692db07-4b8f-4774-ba0b-abe3ecc43652_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_5692db07-4b8f-4774-ba0b-abe3ecc43652" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5692db07-4b8f-4774-ba0b-abe3ecc43652_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7a898e63-b90f-439e-b027-6d6752b3b7af" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_5692db07-4b8f-4774-ba0b-abe3ecc43652" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7a898e63-b90f-439e-b027-6d6752b3b7af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_6e980dff-6454-44b8-a20a-f14c0718c6c3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7a898e63-b90f-439e-b027-6d6752b3b7af" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_6e980dff-6454-44b8-a20a-f14c0718c6c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_4a966128-d9a2-4ccb-8384-2b60f3330ee6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6734fcd0-774a-4f2e-81b9-90dddabeeacb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_4a966128-d9a2-4ccb-8384-2b60f3330ee6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_47590f66-8031-4e5b-ac95-d1795b294489" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_4a966128-d9a2-4ccb-8384-2b60f3330ee6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_47590f66-8031-4e5b-ac95-d1795b294489" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_7df918f5-c76f-41ea-83b7-738124309518" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_4a966128-d9a2-4ccb-8384-2b60f3330ee6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_7df918f5-c76f-41ea-83b7-738124309518" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_5c9d9c10-fcec-4568-85ea-a808495729e1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingNumber_272df6e3-8d36-43a0-a0e3-f912fe01034d" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6734fcd0-774a-4f2e-81b9-90dddabeeacb" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingNumber_272df6e3-8d36-43a0-a0e3-f912fe01034d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableNumber_58660c47-7160-4da2-bc5b-874356b5c69d" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6734fcd0-774a-4f2e-81b9-90dddabeeacb" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableNumber_58660c47-7160-4da2-bc5b-874356b5c69d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_bc300b4a-8e42-49af-981a-7811ccc7c339" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6734fcd0-774a-4f2e-81b9-90dddabeeacb" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_bc300b4a-8e42-49af-981a-7811ccc7c339" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_6d48c401-ffe0-46c8-a9ff-65369feb952b" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_bc300b4a-8e42-49af-981a-7811ccc7c339" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_6d48c401-ffe0-46c8-a9ff-65369feb952b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesInPeriodWeightedAverageExercisePrice_7ab329fe-f0b8-4433-9584-0af78c39e2f4" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_bc300b4a-8e42-49af-981a-7811ccc7c339" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesInPeriodWeightedAverageExercisePrice_7ab329fe-f0b8-4433-9584-0af78c39e2f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_f3180dcc-07ee-4bb7-b29f-d53989d609b2" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_e8e3263a-4fd2-4040-9657-299d445d292c" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6734fcd0-774a-4f2e-81b9-90dddabeeacb" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_e8e3263a-4fd2-4040-9657-299d445d292c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice_da32a316-2096-4e6f-b266-f11b66c8332d" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6734fcd0-774a-4f2e-81b9-90dddabeeacb" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice_da32a316-2096-4e6f-b266-f11b66c8332d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_6e7d64ef-eca2-4479-b8f4-e8f7e7d3fa6a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6734fcd0-774a-4f2e-81b9-90dddabeeacb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_6e7d64ef-eca2-4479-b8f4-e8f7e7d3fa6a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_785ed00f-c048-4e77-b134-4d4ed0d2ec46" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_6e7d64ef-eca2-4479-b8f4-e8f7e7d3fa6a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_785ed00f-c048-4e77-b134-4d4ed0d2ec46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm_82569765-8c63-413b-b3d9-05a8b73fff42" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_6e7d64ef-eca2-4479-b8f4-e8f7e7d3fa6a" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm_82569765-8c63-413b-b3d9-05a8b73fff42" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageRemainingContractualTerm_2bd68a63-d472-4813-8fd8-1f7f2877ed8b" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageRemainingContractualTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_6e7d64ef-eca2-4479-b8f4-e8f7e7d3fa6a" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageRemainingContractualTerm_2bd68a63-d472-4813-8fd8-1f7f2877ed8b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_6f7bcc61-bfbd-464a-bec1-5ef80e900d2e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_6e7d64ef-eca2-4479-b8f4-e8f7e7d3fa6a" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_6f7bcc61-bfbd-464a-bec1-5ef80e900d2e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_82ee464d-041e-4c45-a108-87ebfa43c314" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_6e7d64ef-eca2-4479-b8f4-e8f7e7d3fa6a" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_82ee464d-041e-4c45-a108-87ebfa43c314" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAggregateIntrinsicValue_a367f11a-59bb-4548-b50b-05d985933f6b" xlink:href="embc-20241231.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAggregateIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_6e7d64ef-eca2-4479-b8f4-e8f7e7d3fa6a" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAggregateIntrinsicValue_a367f11a-59bb-4548-b50b-05d985933f6b" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/GoodwillandOtherIntangibleAssetsScheduleofGoodwillandOtherIntangibleAssetsDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#GoodwillandOtherIntangibleAssetsScheduleofGoodwillandOtherIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/GoodwillandOtherIntangibleAssetsScheduleofGoodwillandOtherIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b2c1575d-d6b2-4b78-bc1c-a8fb7d64eb0a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f9f7c5be-5b2a-4aa7-9df7-74cb8465a114" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b2c1575d-d6b2-4b78-bc1c-a8fb7d64eb0a" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f9f7c5be-5b2a-4aa7-9df7-74cb8465a114" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_864da878-3d98-426b-b1a1-f0d95bb773e3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f9f7c5be-5b2a-4aa7-9df7-74cb8465a114" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_864da878-3d98-426b-b1a1-f0d95bb773e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_864da878-3d98-426b-b1a1-f0d95bb773e3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_864da878-3d98-426b-b1a1-f0d95bb773e3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_864da878-3d98-426b-b1a1-f0d95bb773e3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0ae02e02-954b-41e4-a99f-db3ef569f374" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_864da878-3d98-426b-b1a1-f0d95bb773e3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0ae02e02-954b-41e4-a99f-db3ef569f374" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_569297b3-0efa-41aa-a50d-c083c5e1869c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PatentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0ae02e02-954b-41e4-a99f-db3ef569f374" xlink:to="loc_us-gaap_PatentsMember_569297b3-0efa-41aa-a50d-c083c5e1869c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_CustomerRelationshipAndOtherMember_c33ddfa4-342a-4b50-8a54-52897afebd54" xlink:href="embc-20241231.xsd#embc_CustomerRelationshipAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0ae02e02-954b-41e4-a99f-db3ef569f374" xlink:to="loc_embc_CustomerRelationshipAndOtherMember_c33ddfa4-342a-4b50-8a54-52897afebd54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_9f2893e7-c9b4-44ab-8156-bd57e4e5acee" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b2c1575d-d6b2-4b78-bc1c-a8fb7d64eb0a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_9f2893e7-c9b4-44ab-8156-bd57e4e5acee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c843e272-0018-42de-8162-fbe9c93ce9f0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b2c1575d-d6b2-4b78-bc1c-a8fb7d64eb0a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c843e272-0018-42de-8162-fbe9c93ce9f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_18e23293-d2bb-4fc6-be93-56a34b647ae7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b2c1575d-d6b2-4b78-bc1c-a8fb7d64eb0a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_18e23293-d2bb-4fc6-be93-56a34b647ae7" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/CloudComputingArrangementsAdditionalInformationDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#CloudComputingArrangementsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/CloudComputingArrangementsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_5962300c-0dc8-4e9d-855f-480d279d9be6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_ae02044d-96e0-4be0-989a-5d9dfdac9b58" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_5962300c-0dc8-4e9d-855f-480d279d9be6" xlink:to="loc_us-gaap_StatementTable_ae02044d-96e0-4be0-989a-5d9dfdac9b58" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_cd979cdf-7f15-49ab-9f27-7c16b590fbeb" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_ae02044d-96e0-4be0-989a-5d9dfdac9b58" xlink:to="loc_srt_RangeAxis_cd979cdf-7f15-49ab-9f27-7c16b590fbeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_cd979cdf-7f15-49ab-9f27-7c16b590fbeb_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_cd979cdf-7f15-49ab-9f27-7c16b590fbeb" xlink:to="loc_srt_RangeMember_cd979cdf-7f15-49ab-9f27-7c16b590fbeb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c2708434-c1fd-47b0-bc4e-03879ddc6401" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_cd979cdf-7f15-49ab-9f27-7c16b590fbeb" xlink:to="loc_srt_RangeMember_c2708434-c1fd-47b0-bc4e-03879ddc6401" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_4b0513ea-f5ca-4979-9d65-f83e8cfcc757" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c2708434-c1fd-47b0-bc4e-03879ddc6401" xlink:to="loc_srt_MinimumMember_4b0513ea-f5ca-4979-9d65-f83e8cfcc757" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_68389998-006f-4fc2-b6f4-30c321055c8c" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c2708434-c1fd-47b0-bc4e-03879ddc6401" xlink:to="loc_srt_MaximumMember_68389998-006f-4fc2-b6f4-30c321055c8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HostingArrangementServiceContractImplementationCostExpenseAmortization_53da1e61-d4fa-4500-945c-812d529a16f8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HostingArrangementServiceContractImplementationCostExpenseAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5962300c-0dc8-4e9d-855f-480d279d9be6" xlink:to="loc_us-gaap_HostingArrangementServiceContractImplementationCostExpenseAmortization_53da1e61-d4fa-4500-945c-812d529a16f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_HostingArrangementServiceContractAssetsInServiceUsefulLife_83b9b4d3-372b-44a7-8ef7-88bbd9f22d0a" xlink:href="embc-20241231.xsd#embc_HostingArrangementServiceContractAssetsInServiceUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5962300c-0dc8-4e9d-855f-480d279d9be6" xlink:to="loc_embc_HostingArrangementServiceContractAssetsInServiceUsefulLife_83b9b4d3-372b-44a7-8ef7-88bbd9f22d0a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/LongTermDebtAdditionalInformationDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#LongTermDebtAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/LongTermDebtAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_2fdb70e4-eb80-48bd-bcca-c4cd8782aab5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_DebtInstrumentTable_2fdb70e4-eb80-48bd-bcca-c4cd8782aab5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_4d909cf9-4281-421d-818e-85aecc6ee373" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_2fdb70e4-eb80-48bd-bcca-c4cd8782aab5" xlink:to="loc_us-gaap_DebtInstrumentAxis_4d909cf9-4281-421d-818e-85aecc6ee373" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4d909cf9-4281-421d-818e-85aecc6ee373_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_4d909cf9-4281-421d-818e-85aecc6ee373" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4d909cf9-4281-421d-818e-85aecc6ee373_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b8100440-f457-4eec-80b9-856d77841b61" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_4d909cf9-4281-421d-818e-85aecc6ee373" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b8100440-f457-4eec-80b9-856d77841b61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_SeniorSecuredTermLoanBMaturingMarch2029Member_d8400341-58d6-4412-9a2d-b66b4abe5cdb" xlink:href="embc-20241231.xsd#embc_SeniorSecuredTermLoanBMaturingMarch2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b8100440-f457-4eec-80b9-856d77841b61" xlink:to="loc_embc_SeniorSecuredTermLoanBMaturingMarch2029Member_d8400341-58d6-4412-9a2d-b66b4abe5cdb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_SeniorSecuredRevolvingCreditFacilityMaturing2027Member_4a38efe7-42f4-41f1-b2c3-c9dee66b086d" xlink:href="embc-20241231.xsd#embc_SeniorSecuredRevolvingCreditFacilityMaturing2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b8100440-f457-4eec-80b9-856d77841b61" xlink:to="loc_embc_SeniorSecuredRevolvingCreditFacilityMaturing2027Member_4a38efe7-42f4-41f1-b2c3-c9dee66b086d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_A500SeniorSecuredNotesDueFebruary2030Member_c373968b-a0d8-41ee-9584-01ae547f445b" xlink:href="embc-20241231.xsd#embc_A500SeniorSecuredNotesDueFebruary2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b8100440-f457-4eec-80b9-856d77841b61" xlink:to="loc_embc_A500SeniorSecuredNotesDueFebruary2030Member_c373968b-a0d8-41ee-9584-01ae547f445b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_A675SeniorSecuredNotesDueFebruary2030Member_fc62f4e8-6a31-4398-b83c-2eb322c80b39" xlink:href="embc-20241231.xsd#embc_A675SeniorSecuredNotesDueFebruary2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b8100440-f457-4eec-80b9-856d77841b61" xlink:to="loc_embc_A675SeniorSecuredNotesDueFebruary2030Member_fc62f4e8-6a31-4398-b83c-2eb322c80b39" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_f3f1f791-244a-4ec4-a2ab-c8dec9e0538d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_2fdb70e4-eb80-48bd-bcca-c4cd8782aab5" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_f3f1f791-244a-4ec4-a2ab-c8dec9e0538d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_f3f1f791-244a-4ec4-a2ab-c8dec9e0538d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f3f1f791-244a-4ec4-a2ab-c8dec9e0538d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_f3f1f791-244a-4ec4-a2ab-c8dec9e0538d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_f7db3a34-d9ea-4b67-9e7a-1eef022c879f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f3f1f791-244a-4ec4-a2ab-c8dec9e0538d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_f7db3a34-d9ea-4b67-9e7a-1eef022c879f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_1e634cd7-fe71-4d02-98fd-7fbcdd43670a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_f7db3a34-d9ea-4b67-9e7a-1eef022c879f" xlink:to="loc_us-gaap_SecuredDebtMember_1e634cd7-fe71-4d02-98fd-7fbcdd43670a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_a5aff423-8f41-41c9-b8d3-6ffad2d00fc7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_f7db3a34-d9ea-4b67-9e7a-1eef022c879f" xlink:to="loc_us-gaap_SeniorNotesMember_a5aff423-8f41-41c9-b8d3-6ffad2d00fc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_1a8c00c6-2247-44af-848b-a2618bb3daf6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_2fdb70e4-eb80-48bd-bcca-c4cd8782aab5" xlink:to="loc_us-gaap_CreditFacilityAxis_1a8c00c6-2247-44af-848b-a2618bb3daf6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_1a8c00c6-2247-44af-848b-a2618bb3daf6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_1a8c00c6-2247-44af-848b-a2618bb3daf6" xlink:to="loc_us-gaap_CreditFacilityDomain_1a8c00c6-2247-44af-848b-a2618bb3daf6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_38ba4a5d-85e6-45e7-8690-c394679cca77" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_1a8c00c6-2247-44af-848b-a2618bb3daf6" xlink:to="loc_us-gaap_CreditFacilityDomain_38ba4a5d-85e6-45e7-8690-c394679cca77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_4dc58253-7010-4d30-ad07-afe668c24157" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_38ba4a5d-85e6-45e7-8690-c394679cca77" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_4dc58253-7010-4d30-ad07-afe668c24157" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c27ac845-8aed-4150-98fb-d5b574bd333a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_2fdb70e4-eb80-48bd-bcca-c4cd8782aab5" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c27ac845-8aed-4150-98fb-d5b574bd333a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c27ac845-8aed-4150-98fb-d5b574bd333a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c27ac845-8aed-4150-98fb-d5b574bd333a" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c27ac845-8aed-4150-98fb-d5b574bd333a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c222f26a-89fd-49d8-a03b-31956159d93a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c27ac845-8aed-4150-98fb-d5b574bd333a" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c222f26a-89fd-49d8-a03b-31956159d93a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_ea1ac4a6-b55a-490c-a5c0-98b15f4675ce" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c222f26a-89fd-49d8-a03b-31956159d93a" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_ea1ac4a6-b55a-490c-a5c0-98b15f4675ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_649f88da-3b8a-4207-bfe0-4878edda41e2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_2fdb70e4-eb80-48bd-bcca-c4cd8782aab5" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_649f88da-3b8a-4207-bfe0-4878edda41e2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_649f88da-3b8a-4207-bfe0-4878edda41e2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_649f88da-3b8a-4207-bfe0-4878edda41e2" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_649f88da-3b8a-4207-bfe0-4878edda41e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_cfaff44d-ae83-4b27-913f-a20a1d98a072" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_649f88da-3b8a-4207-bfe0-4878edda41e2" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_cfaff44d-ae83-4b27-913f-a20a1d98a072" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_1660668a-6f49-43be-af2f-d2b5bd9deee5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_cfaff44d-ae83-4b27-913f-a20a1d98a072" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_1660668a-6f49-43be-af2f-d2b5bd9deee5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_e9608971-528c-49f1-84b3-1181247c80e5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_1660668a-6f49-43be-af2f-d2b5bd9deee5" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_e9608971-528c-49f1-84b3-1181247c80e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_735783aa-0ce1-4d2e-adf2-9d2b388a9f5f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_1660668a-6f49-43be-af2f-d2b5bd9deee5" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_735783aa-0ce1-4d2e-adf2-9d2b388a9f5f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_a8e2a664-8d33-4b57-9529-1a0d9c07076e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_a8e2a664-8d33-4b57-9529-1a0d9c07076e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_0283d737-f606-4486-ab9e-87ca6ef52639" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_DebtInstrumentTerm_0283d737-f606-4486-ab9e-87ca6ef52639" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_b100c41d-0cd9-43e6-bfab-57974081fc5f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_b100c41d-0cd9-43e6-bfab-57974081fc5f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_DebtInstrumentVariableRateFloor_095b800d-074f-46d8-ab1f-2b6e00636c3b" xlink:href="embc-20241231.xsd#embc_DebtInstrumentVariableRateFloor"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_embc_DebtInstrumentVariableRateFloor_095b800d-074f-46d8-ab1f-2b6e00636c3b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_DebtInstrumentDiscountPercentage_4d4fab95-9e89-4b71-a532-80f8ff70317b" xlink:href="embc-20241231.xsd#embc_DebtInstrumentDiscountPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_embc_DebtInstrumentDiscountPercentage_4d4fab95-9e89-4b71-a532-80f8ff70317b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_DebtInstrumentPeriodicPaymentPrincipalPercentage_f1974707-b585-4eaa-8ec3-8b842defa8e6" xlink:href="embc-20241231.xsd#embc_DebtInstrumentPeriodicPaymentPrincipalPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_embc_DebtInstrumentPeriodicPaymentPrincipalPercentage_f1974707-b585-4eaa-8ec3-8b842defa8e6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_cdddbb97-e6ea-490d-a09d-6b7930b3dfd1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_cdddbb97-e6ea-490d-a09d-6b7930b3dfd1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_0986714e-5f48-466c-956d-3a1fb1077395" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_0986714e-5f48-466c-956d-3a1fb1077395" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_b2581886-ee13-461c-9e2c-32a49c552d7a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_LineOfCredit_b2581886-ee13-461c-9e2c-32a49c552d7a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_174cdecb-424a-4d83-affa-0178dd625271" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_174cdecb-424a-4d83-affa-0178dd625271" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_4f2bcc0a-06ed-4aef-a339-0fa3482c85d0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_InterestPaidNet_4f2bcc0a-06ed-4aef-a339-0fa3482c85d0" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_21d71284-34b4-4943-be50-336056202e5c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_21d71284-34b4-4943-be50-336056202e5c" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSecuredDebt_73d684ea-5400-473b-adfe-53295372484d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RepaymentsOfSecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_RepaymentsOfSecuredDebt_73d684ea-5400-473b-adfe-53295372484d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount_f5f389c3-d88a-4114-ad8d-aa8c0c0a8e63" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ExtinguishmentOfDebtAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_ExtinguishmentOfDebtAmount_f5f389c3-d88a-4114-ad8d-aa8c0c0a8e63" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_3053e539-805c-4a22-9def-4ed88f10604c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_723bc4f6-2c38-4b18-bc8f-c7ba97a50d01" xlink:to="loc_us-gaap_LongTermDebtFairValue_3053e539-805c-4a22-9def-4ed88f10604c" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/LongTermDebtDebtOutstandingDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#LongTermDebtDebtOutstandingDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/LongTermDebtDebtOutstandingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_655fb858-b366-4a14-afe4-0d2f8e7cd5f9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_66e532bc-acfa-40ec-a9ec-97d33c918064" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_655fb858-b366-4a14-afe4-0d2f8e7cd5f9" xlink:to="loc_us-gaap_DebtInstrumentTable_66e532bc-acfa-40ec-a9ec-97d33c918064" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_5440cf6d-8a4c-4e0a-9a70-cda40a9fb3d4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_66e532bc-acfa-40ec-a9ec-97d33c918064" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_5440cf6d-8a4c-4e0a-9a70-cda40a9fb3d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5440cf6d-8a4c-4e0a-9a70-cda40a9fb3d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_5440cf6d-8a4c-4e0a-9a70-cda40a9fb3d4" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5440cf6d-8a4c-4e0a-9a70-cda40a9fb3d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5aab5541-29ff-4a6b-bea0-7e0765da5c8a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_5440cf6d-8a4c-4e0a-9a70-cda40a9fb3d4" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5aab5541-29ff-4a6b-bea0-7e0765da5c8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_54fb27e0-00e7-40f6-98b5-38fc36047897" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5aab5541-29ff-4a6b-bea0-7e0765da5c8a" xlink:to="loc_us-gaap_SecuredDebtMember_54fb27e0-00e7-40f6-98b5-38fc36047897" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_0d479b31-d44e-484e-9925-ce85ede604f2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5aab5541-29ff-4a6b-bea0-7e0765da5c8a" xlink:to="loc_us-gaap_SeniorNotesMember_0d479b31-d44e-484e-9925-ce85ede604f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_06174992-3605-4ab2-b53a-bdf5031a2fe4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_66e532bc-acfa-40ec-a9ec-97d33c918064" xlink:to="loc_us-gaap_DebtInstrumentAxis_06174992-3605-4ab2-b53a-bdf5031a2fe4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_06174992-3605-4ab2-b53a-bdf5031a2fe4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_06174992-3605-4ab2-b53a-bdf5031a2fe4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_06174992-3605-4ab2-b53a-bdf5031a2fe4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cdfa789a-0c16-4cd6-832c-b9e08340a0f3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_06174992-3605-4ab2-b53a-bdf5031a2fe4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cdfa789a-0c16-4cd6-832c-b9e08340a0f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_SeniorSecuredTermLoanBMaturingMarch2029Member_3417cd45-16c6-4b12-a4a1-fd57df1dbb0e" xlink:href="embc-20241231.xsd#embc_SeniorSecuredTermLoanBMaturingMarch2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cdfa789a-0c16-4cd6-832c-b9e08340a0f3" xlink:to="loc_embc_SeniorSecuredTermLoanBMaturingMarch2029Member_3417cd45-16c6-4b12-a4a1-fd57df1dbb0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_A500SeniorSecuredNotesDueFebruary2030Member_40a4e6b8-cea9-43bc-8614-a6eb2793d290" xlink:href="embc-20241231.xsd#embc_A500SeniorSecuredNotesDueFebruary2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cdfa789a-0c16-4cd6-832c-b9e08340a0f3" xlink:to="loc_embc_A500SeniorSecuredNotesDueFebruary2030Member_40a4e6b8-cea9-43bc-8614-a6eb2793d290" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_A675SeniorSecuredNotesDueFebruary2030Member_08d27683-4061-4e0a-8fe4-89cf18f6a859" xlink:href="embc-20241231.xsd#embc_A675SeniorSecuredNotesDueFebruary2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cdfa789a-0c16-4cd6-832c-b9e08340a0f3" xlink:to="loc_embc_A675SeniorSecuredNotesDueFebruary2030Member_08d27683-4061-4e0a-8fe4-89cf18f6a859" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_5a0fd8a3-128f-4bc8-9564-b73a23ca13e6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_655fb858-b366-4a14-afe4-0d2f8e7cd5f9" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_5a0fd8a3-128f-4bc8-9564-b73a23ca13e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_6618cd69-8ebf-4b0f-b160-5e85ce261590" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_655fb858-b366-4a14-afe4-0d2f8e7cd5f9" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_6618cd69-8ebf-4b0f-b160-5e85ce261590" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_a3d10b5a-03ae-495e-9078-6efaadca58ac" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_655fb858-b366-4a14-afe4-0d2f8e7cd5f9" xlink:to="loc_us-gaap_LongTermDebtCurrent_a3d10b5a-03ae-495e-9078-6efaadca58ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_04c1a7a0-9c86-4b9a-b4dd-01fdbb99c4a1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_655fb858-b366-4a14-afe4-0d2f8e7cd5f9" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_04c1a7a0-9c86-4b9a-b4dd-01fdbb99c4a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_729cf99f-991d-47d7-bca9-b90ba61fa8f1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_655fb858-b366-4a14-afe4-0d2f8e7cd5f9" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_729cf99f-991d-47d7-bca9-b90ba61fa8f1" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/FinancialInstrumentsandFairValueMeasurementsAdditionalInformationDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#FinancialInstrumentsandFairValueMeasurementsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/FinancialInstrumentsandFairValueMeasurementsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_7cf1abb3-f615-4524-9ab0-ad946270c0ef" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_0edde896-2891-4d5d-8b99-fbfea32afc7c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_7cf1abb3-f615-4524-9ab0-ad946270c0ef" xlink:to="loc_us-gaap_ConcentrationRiskTable_0edde896-2891-4d5d-8b99-fbfea32afc7c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_70598a10-9275-47a7-a181-6fd07a5cb08c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_0edde896-2891-4d5d-8b99-fbfea32afc7c" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_70598a10-9275-47a7-a181-6fd07a5cb08c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_70598a10-9275-47a7-a181-6fd07a5cb08c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_70598a10-9275-47a7-a181-6fd07a5cb08c" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_70598a10-9275-47a7-a181-6fd07a5cb08c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_80b92633-e0ca-4245-ab0b-f812a6ac187c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_70598a10-9275-47a7-a181-6fd07a5cb08c" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_80b92633-e0ca-4245-ab0b-f812a6ac187c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_e170a5f0-9bec-4528-909d-9af263c24ddc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_80b92633-e0ca-4245-ab0b-f812a6ac187c" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_e170a5f0-9bec-4528-909d-9af263c24ddc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1068c85a-8424-4e55-b5d0-d0657df82b2e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_0edde896-2891-4d5d-8b99-fbfea32afc7c" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1068c85a-8424-4e55-b5d0-d0657df82b2e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_1068c85a-8424-4e55-b5d0-d0657df82b2e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1068c85a-8424-4e55-b5d0-d0657df82b2e" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_1068c85a-8424-4e55-b5d0-d0657df82b2e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e94c8071-1e0e-48fb-84c2-143ff44c7d45" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1068c85a-8424-4e55-b5d0-d0657df82b2e" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e94c8071-1e0e-48fb-84c2-143ff44c7d45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerMember_ab8e82af-4f41-4712-9e43-25df30c7973b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e94c8071-1e0e-48fb-84c2-143ff44c7d45" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerMember_ab8e82af-4f41-4712-9e43-25df30c7973b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_584dcf49-b7c9-4b79-ad53-bde241900e0e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e94c8071-1e0e-48fb-84c2-143ff44c7d45" xlink:to="loc_us-gaap_AccountsReceivableMember_584dcf49-b7c9-4b79-ad53-bde241900e0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_efd17867-5112-4002-a730-a00da5bfb052" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_0edde896-2891-4d5d-8b99-fbfea32afc7c" xlink:to="loc_srt_MajorCustomersAxis_efd17867-5112-4002-a730-a00da5bfb052" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_efd17867-5112-4002-a730-a00da5bfb052_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_efd17867-5112-4002-a730-a00da5bfb052" xlink:to="loc_srt_NameOfMajorCustomerDomain_efd17867-5112-4002-a730-a00da5bfb052_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_b872862b-f6c0-43aa-aa1e-4b8db39d32e4" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_efd17867-5112-4002-a730-a00da5bfb052" xlink:to="loc_srt_NameOfMajorCustomerDomain_b872862b-f6c0-43aa-aa1e-4b8db39d32e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_CustomerOneCustomerTwoAndCustomerThreeMember_bf185358-02ac-4e35-95b8-17f8b3f7dd58" xlink:href="embc-20241231.xsd#embc_CustomerOneCustomerTwoAndCustomerThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_b872862b-f6c0-43aa-aa1e-4b8db39d32e4" xlink:to="loc_embc_CustomerOneCustomerTwoAndCustomerThreeMember_bf185358-02ac-4e35-95b8-17f8b3f7dd58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_CustomerOneAndCustomerTwoMember_d8e1a315-e4c7-4c84-97da-8f66d5965e8b" xlink:href="embc-20241231.xsd#embc_CustomerOneAndCustomerTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_b872862b-f6c0-43aa-aa1e-4b8db39d32e4" xlink:to="loc_embc_CustomerOneAndCustomerTwoMember_d8e1a315-e4c7-4c84-97da-8f66d5965e8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_801fb9b9-1406-48ed-b6bf-2c17a116117e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_0edde896-2891-4d5d-8b99-fbfea32afc7c" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_801fb9b9-1406-48ed-b6bf-2c17a116117e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_801fb9b9-1406-48ed-b6bf-2c17a116117e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_801fb9b9-1406-48ed-b6bf-2c17a116117e" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_801fb9b9-1406-48ed-b6bf-2c17a116117e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_f8921656-d311-41d7-8105-7c65def07280" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_801fb9b9-1406-48ed-b6bf-2c17a116117e" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_f8921656-d311-41d7-8105-7c65def07280" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_6c6ed1a0-9e02-4149-b4df-68a6627ea17a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_f8921656-d311-41d7-8105-7c65def07280" xlink:to="loc_us-gaap_CostOfSalesMember_6c6ed1a0-9e02-4149-b4df-68a6627ea17a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_3b429616-8680-451b-beeb-4e8c2dd7fdd9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_f8921656-d311-41d7-8105-7c65def07280" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_3b429616-8680-451b-beeb-4e8c2dd7fdd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOther_c4a60dd2-2a5b-4a01-9778-58a3ff2ec905" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestIncomeOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_7cf1abb3-f615-4524-9ab0-ad946270c0ef" xlink:to="loc_us-gaap_InterestIncomeOther_c4a60dd2-2a5b-4a01-9778-58a3ff2ec905" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TangibleAssetImpairmentCharges_0bc7d22e-6b04-4125-8d65-dd0d57b745ae" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TangibleAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_7cf1abb3-f615-4524-9ab0-ad946270c0ef" xlink:to="loc_us-gaap_TangibleAssetImpairmentCharges_0bc7d22e-6b04-4125-8d65-dd0d57b745ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_57060c4e-efdb-4f73-883c-5e523836b161" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_7cf1abb3-f615-4524-9ab0-ad946270c0ef" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_57060c4e-efdb-4f73-883c-5e523836b161" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/FinancialInstrumentsandFairValueMeasurementsNotionalAmountsofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#FinancialInstrumentsandFairValueMeasurementsNotionalAmountsofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/FinancialInstrumentsandFairValueMeasurementsNotionalAmountsofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_2cc88935-d43c-42bd-9202-8f8c4aa36b30" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_2c381f9a-68dc-4b59-851b-3bc8ee4c1f4b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_2cc88935-d43c-42bd-9202-8f8c4aa36b30" xlink:to="loc_us-gaap_DerivativeTable_2c381f9a-68dc-4b59-851b-3bc8ee4c1f4b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_9ccec0ee-7cf7-497f-997f-b7531c09780a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_2c381f9a-68dc-4b59-851b-3bc8ee4c1f4b" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_9ccec0ee-7cf7-497f-997f-b7531c09780a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_9ccec0ee-7cf7-497f-997f-b7531c09780a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_9ccec0ee-7cf7-497f-997f-b7531c09780a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_9ccec0ee-7cf7-497f-997f-b7531c09780a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_15b89a67-bd1e-4143-9f4c-72645e78d970" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_9ccec0ee-7cf7-497f-997f-b7531c09780a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_15b89a67-bd1e-4143-9f4c-72645e78d970" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_3a3f7403-afa7-4941-8e33-c8c9038f1f2d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_15b89a67-bd1e-4143-9f4c-72645e78d970" xlink:to="loc_us-gaap_ForeignExchangeContractMember_3a3f7403-afa7-4941-8e33-c8c9038f1f2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_11c07456-54ea-4c45-a2c0-3c9126ca5ff4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_2c381f9a-68dc-4b59-851b-3bc8ee4c1f4b" xlink:to="loc_us-gaap_HedgingDesignationAxis_11c07456-54ea-4c45-a2c0-3c9126ca5ff4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_11c07456-54ea-4c45-a2c0-3c9126ca5ff4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_11c07456-54ea-4c45-a2c0-3c9126ca5ff4" xlink:to="loc_us-gaap_HedgingDesignationDomain_11c07456-54ea-4c45-a2c0-3c9126ca5ff4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_077ddb4c-ec82-44e7-8445-6a352b63ede7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_11c07456-54ea-4c45-a2c0-3c9126ca5ff4" xlink:to="loc_us-gaap_HedgingDesignationDomain_077ddb4c-ec82-44e7-8445-6a352b63ede7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_7ef41130-a541-4667-891f-fbfcb9f789aa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_077ddb4c-ec82-44e7-8445-6a352b63ede7" xlink:to="loc_us-gaap_NondesignatedMember_7ef41130-a541-4667-891f-fbfcb9f789aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_2ea8f6c8-7c7b-48e9-9437-d5fd67b4f9a7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_2cc88935-d43c-42bd-9202-8f8c4aa36b30" xlink:to="loc_us-gaap_DerivativeNotionalAmount_2ea8f6c8-7c7b-48e9-9437-d5fd67b4f9a7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/PropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#PropertyPlantandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/PropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8e5cbb0b-f3c6-45b5-8de0-42a2af4883b0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_e578320f-5b7f-4493-88c3-4c4c526e9f1f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8e5cbb0b-f3c6-45b5-8de0-42a2af4883b0" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_e578320f-5b7f-4493-88c3-4c4c526e9f1f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_d0b6a631-55d7-4c8e-966f-7e9ccfc167ae" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_e578320f-5b7f-4493-88c3-4c4c526e9f1f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_d0b6a631-55d7-4c8e-966f-7e9ccfc167ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_d0b6a631-55d7-4c8e-966f-7e9ccfc167ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_d0b6a631-55d7-4c8e-966f-7e9ccfc167ae" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_d0b6a631-55d7-4c8e-966f-7e9ccfc167ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9db61238-f6fe-4826-8181-6e723bb75ab6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_d0b6a631-55d7-4c8e-966f-7e9ccfc167ae" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9db61238-f6fe-4826-8181-6e723bb75ab6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_da8a02cc-5728-4594-9541-db4816afadc3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9db61238-f6fe-4826-8181-6e723bb75ab6" xlink:to="loc_us-gaap_LandMember_da8a02cc-5728-4594-9541-db4816afadc3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_d97b6dba-5bde-4131-bbcf-7f9981f7d8bf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9db61238-f6fe-4826-8181-6e723bb75ab6" xlink:to="loc_us-gaap_BuildingMember_d97b6dba-5bde-4131-bbcf-7f9981f7d8bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_8671c4b9-20b5-47c2-9945-76ab38b5783f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9db61238-f6fe-4826-8181-6e723bb75ab6" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_8671c4b9-20b5-47c2-9945-76ab38b5783f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_8379e341-e639-4f13-8260-69c451d1d196" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9db61238-f6fe-4826-8181-6e723bb75ab6" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_8379e341-e639-4f13-8260-69c451d1d196" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_c5667270-9219-4b57-b6bd-7449fffca42f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9db61238-f6fe-4826-8181-6e723bb75ab6" xlink:to="loc_us-gaap_ConstructionInProgressMember_c5667270-9219-4b57-b6bd-7449fffca42f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_6cd27838-e470-4635-82a5-affc077444e7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8e5cbb0b-f3c6-45b5-8de0-42a2af4883b0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_6cd27838-e470-4635-82a5-affc077444e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_7c0987fc-c13a-45ab-b97b-37ed120f1be6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8e5cbb0b-f3c6-45b5-8de0-42a2af4883b0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_7c0987fc-c13a-45ab-b97b-37ed120f1be6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_71bfe59c-1664-4a27-a3b9-ae70de24def2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8e5cbb0b-f3c6-45b5-8de0-42a2af4883b0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_71bfe59c-1664-4a27-a3b9-ae70de24def2" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/PropertyPlantandEquipmentAdditionalInformationDetails" xlink:type="simple" xlink:href="embc-20241231.xsd#PropertyPlantandEquipmentAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/PropertyPlantandEquipmentAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c41c0aa1-acf2-48b9-8680-411ff37d2253" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_34e8bedf-403a-42ab-a883-feac9a9cf44a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c41c0aa1-acf2-48b9-8680-411ff37d2253" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_34e8bedf-403a-42ab-a883-feac9a9cf44a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_783bcf19-0c82-4a17-815c-ff85428534dc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_34e8bedf-403a-42ab-a883-feac9a9cf44a" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_783bcf19-0c82-4a17-815c-ff85428534dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_783bcf19-0c82-4a17-815c-ff85428534dc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_783bcf19-0c82-4a17-815c-ff85428534dc" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_783bcf19-0c82-4a17-815c-ff85428534dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_92acaec0-e992-4914-b82b-410e484b628b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_783bcf19-0c82-4a17-815c-ff85428534dc" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_92acaec0-e992-4914-b82b-410e484b628b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_74471c39-2127-4fe2-97c8-0b9376b0b8ba" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_92acaec0-e992-4914-b82b-410e484b628b" xlink:to="loc_us-gaap_CostOfSalesMember_74471c39-2127-4fe2-97c8-0b9376b0b8ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_445e9c79-23fc-45e3-bcac-6425b4732ef0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_92acaec0-e992-4914-b82b-410e484b628b" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_445e9c79-23fc-45e3-bcac-6425b4732ef0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TangibleAssetImpairmentCharges_9ac42f38-62c9-4c06-a913-b808122ce51a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TangibleAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c41c0aa1-acf2-48b9-8680-411ff37d2253" xlink:to="loc_us-gaap_TangibleAssetImpairmentCharges_9ac42f38-62c9-4c06-a913-b808122ce51a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-roles-2024.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:type="arc" order="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent" xlink:type="arc" order="102"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:type="arc" order="41"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesNoncurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent" xlink:type="arc" order="91"/>
  </link:definitionLink>
</link:linkbase>
