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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019cfdbd-948d-762c-ae49-0d7ec1b22978,g:4c2b64f7-6576-4ad3-8b6f-c11744d2b0cd-->
<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.uei.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="ueic-20260331.xsd#CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019cfdbd-9605-7702-b8bc-742785133930" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019cfdbd-9605-7365-b330-99901b269b65" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019cfdbd-9605-7702-b8bc-742785133930" xlink:to="loc_us-gaap_StatementTable_019cfdbd-9605-7365-b330-99901b269b65" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019cfdbd-9605-77a2-9f6c-00378af931c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019cfdbd-9605-7365-b330-99901b269b65" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019cfdbd-9605-77a2-9f6c-00378af931c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cfdbd-9605-77a2-9f6c-00378af931c9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019cfdbd-9605-77a2-9f6c-00378af931c9" xlink:to="loc_us-gaap_EquityComponentDomain_019cfdbd-9605-77a2-9f6c-00378af931c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cfdbd-9605-7bbe-9411-68d4e6915d16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019cfdbd-9605-77a2-9f6c-00378af931c9" xlink:to="loc_us-gaap_EquityComponentDomain_019cfdbd-9605-7bbe-9411-68d4e6915d16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cfdbd-9605-74e4-a6de-d66359e00384" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cfdbd-9605-7bbe-9411-68d4e6915d16" xlink:to="loc_us-gaap_CommonStockMember_019cfdbd-9605-74e4-a6de-d66359e00384" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019cfdbd-9605-7ad4-9216-1c6aed172d49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cfdbd-9605-7bbe-9411-68d4e6915d16" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019cfdbd-9605-7ad4-9216-1c6aed172d49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019cfdbd-9605-7c1c-97cb-df23583ebe7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cfdbd-9605-7bbe-9411-68d4e6915d16" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019cfdbd-9605-7c1c-97cb-df23583ebe7a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019cfdbd-9605-7d6a-9d94-c120b315b5af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cfdbd-9605-7bbe-9411-68d4e6915d16" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019cfdbd-9605-7d6a-9d94-c120b315b5af" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019cfdbd-9605-7264-a833-e0ec4b520046" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cfdbd-9605-7bbe-9411-68d4e6915d16" xlink:to="loc_us-gaap_RetainedEarningsMember_019cfdbd-9605-7264-a833-e0ec4b520046" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019cfdbd-9605-7702-b8bc-742785133930" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019cfdbd-9605-789e-8426-8913a5545583" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019cfdbd-9605-789e-8426-8913a5545583" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019cfdbd-9605-7ec0-bd88-0972a53e633f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:to="loc_us-gaap_StockholdersEquity_019cfdbd-9605-7ec0-bd88-0972a53e633f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019cfdbd-9605-78f7-ab68-a7851df83229" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:to="loc_us-gaap_TreasuryStockCommonShares_019cfdbd-9605-78f7-ab68-a7851df83229" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019cfdbd-9605-7ccc-9b31-787a480a9ca7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:to="loc_us-gaap_NetIncomeLoss_019cfdbd-9605-7ccc-9b31-787a480a9ca7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_019cfdbd-9605-73f8-b3dc-7dec03d475ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_019cfdbd-9605-73f8-b3dc-7dec03d475ab" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019cfdbd-9605-7e5c-834e-a291d679842a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019cfdbd-9605-7e5c-834e-a291d679842a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019cfdbd-9605-740e-94dc-ce018156bea5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019cfdbd-9605-740e-94dc-ce018156bea5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019cfdbd-9605-7d87-947a-f54106acb2a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019cfdbd-9605-7d87-947a-f54106acb2a4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019cfdbd-9605-7fc1-9995-e49a22d34cd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019cfdbd-9605-7fc1-9995-e49a22d34cd3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_SharesIssuedToDirectorsShares_019cfdbd-9605-7f92-be34-2c9d3db04665" xlink:href="ueic-20260331.xsd#ueic_SharesIssuedToDirectorsShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:to="loc_ueic_SharesIssuedToDirectorsShares_019cfdbd-9605-7f92-be34-2c9d3db04665" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_SharesIssuedToDirectorsValue_019cfdbd-9605-7d08-9cc9-84c6058c9342" xlink:href="ueic-20260331.xsd#ueic_SharesIssuedToDirectorsValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:to="loc_ueic_SharesIssuedToDirectorsValue_019cfdbd-9605-7d08-9cc9-84c6058c9342" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019cfdbd-9605-79c4-9f47-ccb822172801" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfdbd-9605-72b2-915f-ce3d0eeff259" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019cfdbd-9605-79c4-9f47-ccb822172801" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019cfdbd-9605-7eb8-8af6-70bc9c52ef92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019cfdbd-9605-7c02-9cce-cef8f948e1d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019cfdbd-9605-7c4b-b282-32fac3e88aa8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/CashandCashEquivalentsDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#CashandCashEquivalentsDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/CashandCashEquivalentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsLineItems_019cfdbd-9605-70b8-8d2e-c01f8dffb803" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019cfdbd-9605-77c4-ac20-9d348f821d19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfCashAndCashEquivalentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019cfdbd-9605-70b8-8d2e-c01f8dffb803" xlink:to="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019cfdbd-9605-77c4-ac20-9d348f821d19" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019cfdbd-9605-7163-8c35-f85d2fa9aba9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_019cfdbd-9605-77c4-ac20-9d348f821d19" xlink:to="loc_srt_StatementGeographicalAxis_019cfdbd-9605-7163-8c35-f85d2fa9aba9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7163-8c35-f85d2fa9aba9_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019cfdbd-9605-7163-8c35-f85d2fa9aba9" xlink:to="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7163-8c35-f85d2fa9aba9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7b83-b523-25e81188a429" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019cfdbd-9605-7163-8c35-f85d2fa9aba9" xlink:to="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7b83-b523-25e81188a429" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NorthAmericaMember_019cfdbd-9605-77a8-8e9c-616258d892e9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NorthAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7b83-b523-25e81188a429" xlink:to="loc_srt_NorthAmericaMember_019cfdbd-9605-77a8-8e9c-616258d892e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_019cfdbd-9605-7af6-9f04-3eac4d5c8356" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7b83-b523-25e81188a429" xlink:to="loc_country_CN_019cfdbd-9605-7af6-9f04-3eac4d5c8356" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_AsiaExcludingThePeoplesRepublicOfChinaMember_019cfdbd-9605-7705-86f1-5371c636802f" xlink:href="ueic-20260331.xsd#ueic_AsiaExcludingThePeoplesRepublicOfChinaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7b83-b523-25e81188a429" xlink:to="loc_ueic_AsiaExcludingThePeoplesRepublicOfChinaMember_019cfdbd-9605-7705-86f1-5371c636802f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EuropeMember_019cfdbd-9605-7e8d-9f2d-50c17834b88a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EuropeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7b83-b523-25e81188a429" xlink:to="loc_srt_EuropeMember_019cfdbd-9605-7e8d-9f2d-50c17834b88a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SouthAmericaMember_019cfdbd-9605-7159-bc4f-8b2c084d8e83" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SouthAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7b83-b523-25e81188a429" xlink:to="loc_srt_SouthAmericaMember_019cfdbd-9605-7159-bc4f-8b2c084d8e83" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019cfdbd-9605-7adc-89b8-64c59c24abe4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_019cfdbd-9605-70b8-8d2e-c01f8dffb803" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019cfdbd-9605-7adc-89b8-64c59c24abe4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/RevenueandAccountsReceivableNetScheduleofRevenueRecognitionandNetSalestoExternalCustomersbyChannelDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#RevenueandAccountsReceivableNetScheduleofRevenueRecognitionandNetSalestoExternalCustomersbyChannelDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/RevenueandAccountsReceivableNetScheduleofRevenueRecognitionandNetSalestoExternalCustomersbyChannelDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019cfdbd-9605-75eb-a72a-d66062530b5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019cfdbd-9605-794e-9c8c-a101c9692aca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cfdbd-9605-75eb-a72a-d66062530b5c" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cfdbd-9605-794e-9c8c-a101c9692aca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019cfdbd-9605-77e5-b077-12dac20ed7fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019cfdbd-9605-794e-9c8c-a101c9692aca" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019cfdbd-9605-77e5-b077-12dac20ed7fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cfdbd-9605-77e5-b077-12dac20ed7fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019cfdbd-9605-77e5-b077-12dac20ed7fe" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cfdbd-9605-77e5-b077-12dac20ed7fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cfdbd-9605-74ec-a11a-d34231a6531a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019cfdbd-9605-77e5-b077-12dac20ed7fe" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cfdbd-9605-74ec-a11a-d34231a6531a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_019cfdbd-9605-7fd5-ac03-0ad2a693a892" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cfdbd-9605-74ec-a11a-d34231a6531a" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_019cfdbd-9605-7fd5-ac03-0ad2a693a892" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_019cfdbd-9605-7cae-917b-a86a45ae6a38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransferredOverTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cfdbd-9605-74ec-a11a-d34231a6531a" xlink:to="loc_us-gaap_TransferredOverTimeMember_019cfdbd-9605-7cae-917b-a86a45ae6a38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cfdbd-9605-75a0-87c4-cf0b66c2a9d4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019cfdbd-9605-794e-9c8c-a101c9692aca" xlink:to="loc_srt_ProductOrServiceAxis_019cfdbd-9605-75a0-87c4-cf0b66c2a9d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cfdbd-9605-75a0-87c4-cf0b66c2a9d4_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cfdbd-9605-75a0-87c4-cf0b66c2a9d4" xlink:to="loc_srt_ProductsAndServicesDomain_019cfdbd-9605-75a0-87c4-cf0b66c2a9d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cfdbd-9605-7638-95e8-6bcd63a08a4a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cfdbd-9605-75a0-87c4-cf0b66c2a9d4" xlink:to="loc_srt_ProductsAndServicesDomain_019cfdbd-9605-7638-95e8-6bcd63a08a4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_ConnectedHomeMember_019cfdbd-9605-731a-bff2-42b5c2ac69e9" xlink:href="ueic-20260331.xsd#ueic_ConnectedHomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cfdbd-9605-7638-95e8-6bcd63a08a4a" xlink:to="loc_ueic_ConnectedHomeMember_019cfdbd-9605-731a-bff2-42b5c2ac69e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_HomeEntertainmentMember_019cfdbd-9605-71cb-8354-91b139cd745d" xlink:href="ueic-20260331.xsd#ueic_HomeEntertainmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cfdbd-9605-7638-95e8-6bcd63a08a4a" xlink:to="loc_ueic_HomeEntertainmentMember_019cfdbd-9605-71cb-8354-91b139cd745d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cfdbd-9605-7cc9-917a-b00786bbfc99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cfdbd-9605-75eb-a72a-d66062530b5c" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cfdbd-9605-7cc9-917a-b00786bbfc99" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/RevenueandAccountsReceivableNetScheduleofNetSalestoExternalCustomersbyGeographicAreasDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#RevenueandAccountsReceivableNetScheduleofNetSalestoExternalCustomersbyGeographicAreasDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/RevenueandAccountsReceivableNetScheduleofNetSalestoExternalCustomersbyGeographicAreasDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019cfdbd-9605-7819-843e-c55d26f01ec1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019cfdbd-9605-76bc-a451-efcb203d044d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cfdbd-9605-7819-843e-c55d26f01ec1" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cfdbd-9605-76bc-a451-efcb203d044d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019cfdbd-9605-73ed-97c9-8109d9e233fc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019cfdbd-9605-76bc-a451-efcb203d044d" xlink:to="loc_srt_StatementGeographicalAxis_019cfdbd-9605-73ed-97c9-8109d9e233fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-73ed-97c9-8109d9e233fc_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019cfdbd-9605-73ed-97c9-8109d9e233fc" xlink:to="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-73ed-97c9-8109d9e233fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7adb-ae1f-56f7408093f1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019cfdbd-9605-73ed-97c9-8109d9e233fc" xlink:to="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7adb-ae1f-56f7408093f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019cfdbd-9605-7794-aa6e-d332c39e3316" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7adb-ae1f-56f7408093f1" xlink:to="loc_country_US_019cfdbd-9605-7794-aa6e-d332c39e3316" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_AsiaExcludingThePeoplesRepublicOfChinaMember_019cfdbd-9605-7d62-9cf3-e2b088683dc3" xlink:href="ueic-20260331.xsd#ueic_AsiaExcludingThePeoplesRepublicOfChinaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7adb-ae1f-56f7408093f1" xlink:to="loc_ueic_AsiaExcludingThePeoplesRepublicOfChinaMember_019cfdbd-9605-7d62-9cf3-e2b088683dc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EuropeMember_019cfdbd-9605-7320-a2ce-8a283859ffd7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EuropeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7adb-ae1f-56f7408093f1" xlink:to="loc_srt_EuropeMember_019cfdbd-9605-7320-a2ce-8a283859ffd7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LatinAmericaMember_019cfdbd-9605-736b-9c64-58c5cbcc1ccf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LatinAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7adb-ae1f-56f7408093f1" xlink:to="loc_srt_LatinAmericaMember_019cfdbd-9605-736b-9c64-58c5cbcc1ccf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_019cfdbd-9605-74c8-b77b-611670212faf" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7adb-ae1f-56f7408093f1" xlink:to="loc_country_CN_019cfdbd-9605-74c8-b77b-611670212faf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_AllOtherCountriesMember_019cfdbd-9605-71fd-ab9b-0284e73dade4" xlink:href="ueic-20260331.xsd#ueic_AllOtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7adb-ae1f-56f7408093f1" xlink:to="loc_ueic_AllOtherCountriesMember_019cfdbd-9605-71fd-ab9b-0284e73dade4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cfdbd-9605-7be1-b1fc-8be5c6694443" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cfdbd-9605-7819-843e-c55d26f01ec1" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cfdbd-9605-7be1-b1fc-8be5c6694443" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/RevenueandAccountsReceivableNetScheduleofNetSalestoCustomersDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#RevenueandAccountsReceivableNetScheduleofNetSalestoCustomersDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/RevenueandAccountsReceivableNetScheduleofNetSalestoCustomersDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019cfdbd-9605-74bf-99ce-bc5e0cb1052f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019cfdbd-9605-798a-8de4-611bd61847b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cfdbd-9605-74bf-99ce-bc5e0cb1052f" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cfdbd-9605-798a-8de4-611bd61847b1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019cfdbd-9605-7505-acd8-d7ff788e1e3d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019cfdbd-9605-798a-8de4-611bd61847b1" xlink:to="loc_srt_MajorCustomersAxis_019cfdbd-9605-7505-acd8-d7ff788e1e3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019cfdbd-9605-7505-acd8-d7ff788e1e3d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019cfdbd-9605-7505-acd8-d7ff788e1e3d" xlink:to="loc_srt_NameOfMajorCustomerDomain_019cfdbd-9605-7505-acd8-d7ff788e1e3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019cfdbd-9605-7dab-81a1-628b8e541a9a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019cfdbd-9605-7505-acd8-d7ff788e1e3d" xlink:to="loc_srt_NameOfMajorCustomerDomain_019cfdbd-9605-7dab-81a1-628b8e541a9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_DaikinIndustriesLtd.Member_019cfdbd-9605-72bc-b908-85222415d826" xlink:href="ueic-20260331.xsd#ueic_DaikinIndustriesLtd.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cfdbd-9605-7dab-81a1-628b8e541a9a" xlink:to="loc_ueic_DaikinIndustriesLtd.Member_019cfdbd-9605-72bc-b908-85222415d826" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_ComcastCommunicationsMember_019cfdbd-9605-7d11-a431-6d59a53c6a51" xlink:href="ueic-20260331.xsd#ueic_ComcastCommunicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cfdbd-9605-7dab-81a1-628b8e541a9a" xlink:to="loc_ueic_ComcastCommunicationsMember_019cfdbd-9605-7d11-a431-6d59a53c6a51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019cfdbd-9605-72e2-9f89-637f27ef8948" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019cfdbd-9605-798a-8de4-611bd61847b1" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019cfdbd-9605-72e2-9f89-637f27ef8948" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-72e2-9f89-637f27ef8948_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019cfdbd-9605-72e2-9f89-637f27ef8948" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-72e2-9f89-637f27ef8948_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-76cb-baf1-6b0edad08edf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019cfdbd-9605-72e2-9f89-637f27ef8948" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-76cb-baf1-6b0edad08edf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_019cfdbd-9605-784f-a34a-052816f9762a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-76cb-baf1-6b0edad08edf" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_019cfdbd-9605-784f-a34a-052816f9762a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cfdbd-9605-7f63-a5aa-002ecc515f82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019cfdbd-9605-798a-8de4-611bd61847b1" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cfdbd-9605-7f63-a5aa-002ecc515f82" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-7f63-a5aa-002ecc515f82_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cfdbd-9605-7f63-a5aa-002ecc515f82" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-7f63-a5aa-002ecc515f82_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-7a5d-8c43-eeb4cd3f6164" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cfdbd-9605-7f63-a5aa-002ecc515f82" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-7a5d-8c43-eeb4cd3f6164" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_019cfdbd-9605-7f2b-99a2-ab8817a07b74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-7a5d-8c43-eeb4cd3f6164" xlink:to="loc_us-gaap_SalesRevenueNetMember_019cfdbd-9605-7f2b-99a2-ab8817a07b74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cfdbd-9605-7a33-b3ab-42ed7baabd78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cfdbd-9605-74bf-99ce-bc5e0cb1052f" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cfdbd-9605-7a33-b3ab-42ed7baabd78" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019cfdbd-9605-720c-9f91-2a81cf9bda86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cfdbd-9605-74bf-99ce-bc5e0cb1052f" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019cfdbd-9605-720c-9f91-2a81cf9bda86" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/RevenueandAccountsReceivableNetScheduleofTradeReceivableswithCustomersDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#RevenueandAccountsReceivableNetScheduleofTradeReceivableswithCustomersDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/RevenueandAccountsReceivableNetScheduleofTradeReceivableswithCustomersDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019cfdbd-9605-7dff-8674-4cf294e41e0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EntityWideRevenueMajorCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019cfdbd-9605-7ee3-b0e0-2bb807a4f763" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019cfdbd-9605-7dff-8674-4cf294e41e0d" xlink:to="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019cfdbd-9605-7ee3-b0e0-2bb807a4f763" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019cfdbd-9605-7b9b-acd3-c3239efe5a4c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019cfdbd-9605-7ee3-b0e0-2bb807a4f763" xlink:to="loc_srt_MajorCustomersAxis_019cfdbd-9605-7b9b-acd3-c3239efe5a4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019cfdbd-9605-7b9b-acd3-c3239efe5a4c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019cfdbd-9605-7b9b-acd3-c3239efe5a4c" xlink:to="loc_srt_NameOfMajorCustomerDomain_019cfdbd-9605-7b9b-acd3-c3239efe5a4c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019cfdbd-9605-7e99-a186-5e9da3f1989d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019cfdbd-9605-7b9b-acd3-c3239efe5a4c" xlink:to="loc_srt_NameOfMajorCustomerDomain_019cfdbd-9605-7e99-a186-5e9da3f1989d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_DaikinIndustriesLtd.Member_019cfdbd-9605-7645-8d72-bcdb2c9261d6" xlink:href="ueic-20260331.xsd#ueic_DaikinIndustriesLtd.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cfdbd-9605-7e99-a186-5e9da3f1989d" xlink:to="loc_ueic_DaikinIndustriesLtd.Member_019cfdbd-9605-7645-8d72-bcdb2c9261d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cfdbd-9605-7571-b1b6-3fe3daf3169f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019cfdbd-9605-7ee3-b0e0-2bb807a4f763" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cfdbd-9605-7571-b1b6-3fe3daf3169f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-7571-b1b6-3fe3daf3169f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cfdbd-9605-7571-b1b6-3fe3daf3169f" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-7571-b1b6-3fe3daf3169f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-7a76-a511-980e5fd311aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cfdbd-9605-7571-b1b6-3fe3daf3169f" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-7a76-a511-980e5fd311aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeAccountsReceivableMember_019cfdbd-9605-76c0-b819-263d8e48b574" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradeAccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-7a76-a511-980e5fd311aa" xlink:to="loc_us-gaap_TradeAccountsReceivableMember_019cfdbd-9605-76c0-b819-263d8e48b574" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019cfdbd-9605-7d32-be85-1b9138ff4879" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019cfdbd-9605-7ee3-b0e0-2bb807a4f763" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019cfdbd-9605-7d32-be85-1b9138ff4879" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-7d32-be85-1b9138ff4879_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019cfdbd-9605-7d32-be85-1b9138ff4879" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-7d32-be85-1b9138ff4879_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-722d-8893-12526a32d70e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019cfdbd-9605-7d32-be85-1b9138ff4879" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-722d-8893-12526a32d70e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_019cfdbd-9605-7a41-9f98-a104a57a5b03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-722d-8893-12526a32d70e" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_019cfdbd-9605-7a41-9f98-a104a57a5b03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_019cfdbd-9605-7237-bbc1-2f453817c73e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019cfdbd-9605-7dff-8674-4cf294e41e0d" xlink:to="loc_us-gaap_ReceivablesNetCurrent_019cfdbd-9605-7237-bbc1-2f453817c73e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019cfdbd-9605-7386-ae05-2d31fc022765" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019cfdbd-9605-7dff-8674-4cf294e41e0d" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019cfdbd-9605-7386-ae05-2d31fc022765" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/InventoriesScheduleofPurchasesfromSignificantSuppliersDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#InventoriesScheduleofPurchasesfromSignificantSuppliersDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/InventoriesScheduleofPurchasesfromSignificantSuppliersDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_019cfdbd-9605-7268-a9ea-a7aa76ea2380" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_019cfdbd-9605-7359-9caf-2e4debc0f7d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_019cfdbd-9605-7268-a9ea-a7aa76ea2380" xlink:to="loc_us-gaap_ConcentrationRiskTable_019cfdbd-9605-7359-9caf-2e4debc0f7d2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cfdbd-9605-724c-ba48-9cec7556d2e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019cfdbd-9605-7359-9caf-2e4debc0f7d2" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cfdbd-9605-724c-ba48-9cec7556d2e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-724c-ba48-9cec7556d2e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cfdbd-9605-724c-ba48-9cec7556d2e4" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-724c-ba48-9cec7556d2e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-709d-b84f-c46dab01453a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cfdbd-9605-724c-ba48-9cec7556d2e4" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-709d-b84f-c46dab01453a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsTotalMember_019cfdbd-9605-7839-be41-cb8d66386514" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsTotalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cfdbd-9605-709d-b84f-c46dab01453a" xlink:to="loc_us-gaap_CostOfGoodsTotalMember_019cfdbd-9605-7839-be41-cb8d66386514" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019cfdbd-9605-7f00-a978-f0059b2564b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019cfdbd-9605-7359-9caf-2e4debc0f7d2" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019cfdbd-9605-7f00-a978-f0059b2564b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-7f00-a978-f0059b2564b1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019cfdbd-9605-7f00-a978-f0059b2564b1" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-7f00-a978-f0059b2564b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-7fb1-ba36-3bacabb77da7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019cfdbd-9605-7f00-a978-f0059b2564b1" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-7fb1-ba36-3bacabb77da7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplierConcentrationRiskMember_019cfdbd-9605-7420-a11d-dc504d5ce161" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplierConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019cfdbd-9605-7fb1-ba36-3bacabb77da7" xlink:to="loc_us-gaap_SupplierConcentrationRiskMember_019cfdbd-9605-7420-a11d-dc504d5ce161" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis_019cfdbd-9605-7f0e-b613-038ba89038f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019cfdbd-9605-7359-9caf-2e4debc0f7d2" xlink:to="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis_019cfdbd-9605-7f0e-b613-038ba89038f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain_019cfdbd-9605-7f0e-b613-038ba89038f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis_019cfdbd-9605-7f0e-b613-038ba89038f9" xlink:to="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain_019cfdbd-9605-7f0e-b613-038ba89038f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain_019cfdbd-9605-7a28-943a-2b4e6ec5ca33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis_019cfdbd-9605-7f0e-b613-038ba89038f9" xlink:to="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain_019cfdbd-9605-7a28-943a-2b4e6ec5ca33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_QorvoInternationalPteLtdMember_019cfdbd-9605-7a4a-85c4-fc337b357ebe" xlink:href="ueic-20260331.xsd#ueic_QorvoInternationalPteLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSupplierDomain_019cfdbd-9605-7a28-943a-2b4e6ec5ca33" xlink:to="loc_ueic_QorvoInternationalPteLtdMember_019cfdbd-9605-7a4a-85c4-fc337b357ebe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_InventoryPurchases_019cfdbd-9605-7295-b9e7-75c231c3be2f" xlink:href="ueic-20260331.xsd#ueic_InventoryPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_019cfdbd-9605-7268-a9ea-a7aa76ea2380" xlink:to="loc_ueic_InventoryPurchases_019cfdbd-9605-7295-b9e7-75c231c3be2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019cfdbd-9605-7928-986e-8e17ea170fd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_019cfdbd-9605-7268-a9ea-a7aa76ea2380" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019cfdbd-9605-7928-986e-8e17ea170fd4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/LonglivedTangibleAssetsScheduleofLonglivedTangibleAssetsbyGeographicAreaDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#LonglivedTangibleAssetsScheduleofLonglivedTangibleAssetsbyGeographicAreaDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/LonglivedTangibleAssetsScheduleofLonglivedTangibleAssetsbyGeographicAreaDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019cfdbd-9605-75f1-8bd1-a91bc2bacf47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019cfdbd-9605-7fb9-9d5d-a6545ca4208b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019cfdbd-9605-75f1-8bd1-a91bc2bacf47" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019cfdbd-9605-7fb9-9d5d-a6545ca4208b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019cfdbd-9605-7500-b454-4495cd7136a5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019cfdbd-9605-7fb9-9d5d-a6545ca4208b" xlink:to="loc_srt_StatementGeographicalAxis_019cfdbd-9605-7500-b454-4495cd7136a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7500-b454-4495cd7136a5_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019cfdbd-9605-7500-b454-4495cd7136a5" xlink:to="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7500-b454-4495cd7136a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7c43-b221-b5c8583cb75f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019cfdbd-9605-7500-b454-4495cd7136a5" xlink:to="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7c43-b221-b5c8583cb75f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019cfdbd-9605-72ff-9a71-7af30c08fed7" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7c43-b221-b5c8583cb75f" xlink:to="loc_country_US_019cfdbd-9605-72ff-9a71-7af30c08fed7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_019cfdbd-9605-79c2-b06a-9ac4666ff8a7" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7c43-b221-b5c8583cb75f" xlink:to="loc_country_CN_019cfdbd-9605-79c2-b06a-9ac4666ff8a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_VN_019cfdbd-9605-7c85-b4a4-784bd1fd8727" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_VN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7c43-b221-b5c8583cb75f" xlink:to="loc_country_VN_019cfdbd-9605-7c85-b4a4-784bd1fd8727" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MX_019cfdbd-9605-728a-9210-d6050f1b2f6d" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_MX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7c43-b221-b5c8583cb75f" xlink:to="loc_country_MX_019cfdbd-9605-728a-9210-d6050f1b2f6d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_AllOtherCountriesMember_019cfdbd-9605-79af-8ea8-3b47ff697514" xlink:href="ueic-20260331.xsd#ueic_AllOtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cfdbd-9605-7c43-b221-b5c8583cb75f" xlink:to="loc_ueic_AllOtherCountriesMember_019cfdbd-9605-79af-8ea8-3b47ff697514" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_019cfdbd-9605-74c6-9160-3b88875e997d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019cfdbd-9605-75f1-8bd1-a91bc2bacf47" xlink:to="loc_us-gaap_NoncurrentAssets_019cfdbd-9605-74c6-9160-3b88875e997d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/IntangibleAssetsNetScheduleofComponentsofIntangibleAssetsNetDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#IntangibleAssetsNetScheduleofComponentsofIntangibleAssetsNetDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/IntangibleAssetsNetScheduleofComponentsofIntangibleAssetsNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cfdbd-9605-75a2-b69e-d0b47280d0b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cfdbd-9605-75ca-b650-4b2ee2f2599b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cfdbd-9605-75a2-b69e-d0b47280d0b8" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cfdbd-9605-75ca-b650-4b2ee2f2599b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cfdbd-9605-727d-bb96-9e74edd89df7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cfdbd-9605-75ca-b650-4b2ee2f2599b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cfdbd-9605-727d-bb96-9e74edd89df7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cfdbd-9605-727d-bb96-9e74edd89df7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cfdbd-9605-727d-bb96-9e74edd89df7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cfdbd-9605-727d-bb96-9e74edd89df7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cfdbd-9605-76e2-a421-4cb1317018e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cfdbd-9605-727d-bb96-9e74edd89df7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cfdbd-9605-76e2-a421-4cb1317018e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_019cfdbd-9605-7cc7-a921-7a3be0bcc109" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cfdbd-9605-76e2-a421-4cb1317018e6" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_019cfdbd-9605-7cc7-a921-7a3be0bcc109" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019cfdbd-9605-7000-8cd1-f1322d1726a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cfdbd-9605-76e2-a421-4cb1317018e6" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019cfdbd-9605-7000-8cd1-f1322d1726a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_019cfdbd-9605-7d5b-94f8-e1c40c263aa0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cfdbd-9605-76e2-a421-4cb1317018e6" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_019cfdbd-9605-7d5b-94f8-e1c40c263aa0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_019cfdbd-9605-7749-9b15-031bcae62c87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PatentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cfdbd-9605-76e2-a421-4cb1317018e6" xlink:to="loc_us-gaap_PatentsMember_019cfdbd-9605-7749-9b15-031bcae62c87" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_019cfdbd-9605-77c0-bc47-5d433803599d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cfdbd-9605-76e2-a421-4cb1317018e6" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_019cfdbd-9605-77c0-bc47-5d433803599d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_019cfdbd-9605-73d4-9043-a09f76fca45f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cfdbd-9605-75a2-b69e-d0b47280d0b8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_019cfdbd-9605-73d4-9043-a09f76fca45f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019cfdbd-9605-7e3e-ba63-7fb1ec5516f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_019cfdbd-9605-73d4-9043-a09f76fca45f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019cfdbd-9605-7e3e-ba63-7fb1ec5516f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019cfdbd-9605-77b9-8a56-4b7104e8b6ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_019cfdbd-9605-73d4-9043-a09f76fca45f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019cfdbd-9605-77b9-8a56-4b7104e8b6ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cfdbd-9605-7aa9-87ab-9678376c397e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_019cfdbd-9605-73d4-9043-a09f76fca45f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cfdbd-9605-7aa9-87ab-9678376c397e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_FiniteLivedIntangibleAssetsFullyAmortizedGross_019cfdbd-9605-7dd0-ac54-444d738369f1" xlink:href="ueic-20260331.xsd#ueic_FiniteLivedIntangibleAssetsFullyAmortizedGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cfdbd-9605-75a2-b69e-d0b47280d0b8" xlink:to="loc_ueic_FiniteLivedIntangibleAssetsFullyAmortizedGross_019cfdbd-9605-7dd0-ac54-444d738369f1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/IntangibleAssetsNetScheduleofAmortizationExpenseDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#IntangibleAssetsNetScheduleofAmortizationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/IntangibleAssetsNetScheduleofAmortizationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cfdbd-9605-79d9-99f1-a8d43b7acf1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cfdbd-9605-7b3f-8970-1314cca475f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cfdbd-9605-79d9-99f1-a8d43b7acf1d" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cfdbd-9605-7b3f-8970-1314cca475f4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019cfdbd-9605-74f8-82c2-a8bfe10122db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cfdbd-9605-7b3f-8970-1314cca475f4" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019cfdbd-9605-74f8-82c2-a8bfe10122db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9605-74f8-82c2-a8bfe10122db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019cfdbd-9605-74f8-82c2-a8bfe10122db" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9605-74f8-82c2-a8bfe10122db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9605-70d6-886e-c2e61df8755a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019cfdbd-9605-74f8-82c2-a8bfe10122db" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9605-70d6-886e-c2e61df8755a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_019cfdbd-9605-7f09-b6a0-cfe04feca45d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9605-70d6-886e-c2e61df8755a" xlink:to="loc_us-gaap_CostOfSalesMember_019cfdbd-9605-7f09-b6a0-cfe04feca45d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_019cfdbd-9605-726a-b303-d80508d48e6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9605-70d6-886e-c2e61df8755a" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_019cfdbd-9605-726a-b303-d80508d48e6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019cfdbd-9605-794a-a09d-d22697ed501f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cfdbd-9605-79d9-99f1-a8d43b7acf1d" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019cfdbd-9605-794a-a09d-d22697ed501f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cfdbd-9605-744c-84d4-4561bd4f5d8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_019cfdbd-9605-7aea-9495-d590e5bcf306" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cfdbd-9605-744c-84d4-4561bd4f5d8b" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_019cfdbd-9605-7aea-9495-d590e5bcf306" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cfdbd-9605-7283-841d-d7a5082ed187" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019cfdbd-9605-7aea-9495-d590e5bcf306" xlink:to="loc_srt_RangeAxis_019cfdbd-9605-7283-841d-d7a5082ed187" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cfdbd-9605-7283-841d-d7a5082ed187_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019cfdbd-9605-7283-841d-d7a5082ed187" xlink:to="loc_srt_RangeMember_019cfdbd-9605-7283-841d-d7a5082ed187_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cfdbd-9605-7404-8102-867b4eb33644" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019cfdbd-9605-7283-841d-d7a5082ed187" xlink:to="loc_srt_RangeMember_019cfdbd-9605-7404-8102-867b4eb33644" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cfdbd-9605-794f-af10-44655a4e842d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cfdbd-9605-7404-8102-867b4eb33644" xlink:to="loc_srt_MaximumMember_019cfdbd-9605-794f-af10-44655a4e842d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_019cfdbd-9605-793a-a5a3-78bfac5bd003" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseRemainingLeaseTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cfdbd-9605-744c-84d4-4561bd4f5d8b" xlink:to="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_019cfdbd-9605-793a-a5a3-78bfac5bd003" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/LeasesScheduleofOperatingLeaseExpenseOperatingLeaseCashFlowsandSupplementalCashFlowInformationDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#LeasesScheduleofOperatingLeaseExpenseOperatingLeaseCashFlowsandSupplementalCashFlowInformationDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/LeasesScheduleofOperatingLeaseExpenseOperatingLeaseCashFlowsandSupplementalCashFlowInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cfdbd-9605-78ce-9e42-049e914e0312" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_019cfdbd-9605-75cc-97fc-6e1f6009e73d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cfdbd-9605-78ce-9e42-049e914e0312" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_019cfdbd-9605-75cc-97fc-6e1f6009e73d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019cfdbd-9605-7e54-93d0-ffee0a0af7fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019cfdbd-9605-75cc-97fc-6e1f6009e73d" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019cfdbd-9605-7e54-93d0-ffee0a0af7fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9605-7e54-93d0-ffee0a0af7fd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019cfdbd-9605-7e54-93d0-ffee0a0af7fd" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9605-7e54-93d0-ffee0a0af7fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9605-7222-920f-f6345faa8497" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019cfdbd-9605-7e54-93d0-ffee0a0af7fd" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9605-7222-920f-f6345faa8497" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_019cfdbd-9605-7992-878a-217df4afaf25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9605-7222-920f-f6345faa8497" xlink:to="loc_us-gaap_CostOfSalesMember_019cfdbd-9605-7992-878a-217df4afaf25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_019cfdbd-9605-7843-b8c9-0f0b9d732426" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9605-7222-920f-f6345faa8497" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_019cfdbd-9605-7843-b8c9-0f0b9d732426" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_019cfdbd-9605-7f99-bdea-e5ff368e2be0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cfdbd-9605-78ce-9e42-049e914e0312" xlink:to="loc_us-gaap_OperatingLeaseCost_019cfdbd-9605-7f99-bdea-e5ff368e2be0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_OperatingLeasesVariableAndShortTermLeaseCosts_019cfdbd-9605-79e7-afc8-37373a92d00b" xlink:href="ueic-20260331.xsd#ueic_OperatingLeasesVariableAndShortTermLeaseCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cfdbd-9605-78ce-9e42-049e914e0312" xlink:to="loc_ueic_OperatingLeasesVariableAndShortTermLeaseCosts_019cfdbd-9605-79e7-afc8-37373a92d00b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments_019cfdbd-9605-779f-acef-9bc7b372cc63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeasePayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cfdbd-9605-78ce-9e42-049e914e0312" xlink:to="loc_us-gaap_OperatingLeasePayments_019cfdbd-9605-779f-acef-9bc7b372cc63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_019cfdbd-9605-733e-9e09-f1e1073ddea7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cfdbd-9605-78ce-9e42-049e914e0312" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_019cfdbd-9605-733e-9e09-f1e1073ddea7" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/LinesofCreditDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#LinesofCreditDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/LinesofCreditDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_019d2ef6-9ed9-7378-b662-274f8cc859c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_019d2ef6-9ed9-7378-b662-274f8cc859c9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019d2ef6-9ed9-7d84-923a-1e9cd880fd54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019d2ef6-9ed9-7378-b662-274f8cc859c9" xlink:to="loc_us-gaap_CreditFacilityAxis_019d2ef6-9ed9-7d84-923a-1e9cd880fd54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019d2ef6-9ed9-7d84-923a-1e9cd880fd54_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019d2ef6-9ed9-7d84-923a-1e9cd880fd54" xlink:to="loc_us-gaap_CreditFacilityDomain_019d2ef6-9ed9-7d84-923a-1e9cd880fd54_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019d2ef6-9ed9-7d84-b9bd-312d3cb9385e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019d2ef6-9ed9-7d84-923a-1e9cd880fd54" xlink:to="loc_us-gaap_CreditFacilityDomain_019d2ef6-9ed9-7d84-b9bd-312d3cb9385e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019d2ef6-9ed9-7c7c-9a7d-815d7d75ea2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019d2ef6-9ed9-7d84-b9bd-312d3cb9385e" xlink:to="loc_us-gaap_LineOfCreditMember_019d2ef6-9ed9-7c7c-9a7d-815d7d75ea2c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_019d2ef6-9ed9-7fbe-b3bf-8e079b560279" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019d2ef6-9ed9-7d84-b9bd-312d3cb9385e" xlink:to="loc_us-gaap_LetterOfCreditMember_019d2ef6-9ed9-7fbe-b3bf-8e079b560279" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019d2ef6-9ed9-7ef1-b43f-b15277de8241" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019d2ef6-9ed9-7378-b662-274f8cc859c9" xlink:to="loc_us-gaap_DebtInstrumentAxis_019d2ef6-9ed9-7ef1-b43f-b15277de8241" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019d2ef6-9ed9-7ef1-b43f-b15277de8241_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019d2ef6-9ed9-7ef1-b43f-b15277de8241" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019d2ef6-9ed9-7ef1-b43f-b15277de8241_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019d2ef6-9ed9-7bb0-b11f-4c4726a59c50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019d2ef6-9ed9-7ef1-b43f-b15277de8241" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019d2ef6-9ed9-7bb0-b11f-4c4726a59c50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_SecondAmendedCreditAgreementMember_019d2ef6-9ed9-7a4e-91d0-de6aed5dd8c9" xlink:href="ueic-20260331.xsd#ueic_SecondAmendedCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019d2ef6-9ed9-7bb0-b11f-4c4726a59c50" xlink:to="loc_ueic_SecondAmendedCreditAgreementMember_019d2ef6-9ed9-7a4e-91d0-de6aed5dd8c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_U.S.LineOfCreditMember_019d2ef6-cd09-74f3-bb5b-b893b8d6c1aa" xlink:href="ueic-20260331.xsd#ueic_U.S.LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019d2ef6-9ed9-7bb0-b11f-4c4726a59c50" xlink:to="loc_ueic_U.S.LineOfCreditMember_019d2ef6-cd09-74f3-bb5b-b893b8d6c1aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_ChinaLineOfCreditMember_019d2ef6-ea08-73ec-b75a-77e9c7654aa1" xlink:href="ueic-20260331.xsd#ueic_ChinaLineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019d2ef6-9ed9-7bb0-b11f-4c4726a59c50" xlink:to="loc_ueic_ChinaLineOfCreditMember_019d2ef6-ea08-73ec-b75a-77e9c7654aa1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019d2ef6-9ed9-7679-b273-d9c857547f6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019d2ef6-9ed9-7378-b662-274f8cc859c9" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019d2ef6-9ed9-7679-b273-d9c857547f6a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019d2ef6-9ed9-7679-b273-d9c857547f6a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019d2ef6-9ed9-7679-b273-d9c857547f6a" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019d2ef6-9ed9-7679-b273-d9c857547f6a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019d2ef6-9ed9-7d9e-83d1-a1351e5f0efe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019d2ef6-9ed9-7679-b273-d9c857547f6a" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019d2ef6-9ed9-7d9e-83d1-a1351e5f0efe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019d2ef6-9ed9-7d1d-a907-b975eb85c01c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019d2ef6-9ed9-7d9e-83d1-a1351e5f0efe" xlink:to="loc_us-gaap_SubsequentEventMember_019d2ef6-9ed9-7d1d-a907-b975eb85c01c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_019d2ef6-b618-738e-b0f1-5afb4a40072a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019d2ef6-9ed9-7378-b662-274f8cc859c9" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_019d2ef6-b618-738e-b0f1-5afb4a40072a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019d2ef6-b618-738e-b0f1-5afb4a40072a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019d2ef6-b618-738e-b0f1-5afb4a40072a" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019d2ef6-b618-738e-b0f1-5afb4a40072a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019d2ef6-b618-7bba-bda2-dc559bf1f2bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019d2ef6-b618-738e-b0f1-5afb4a40072a" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019d2ef6-b618-7bba-bda2-dc559bf1f2bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_UsBankMember_019d2ef6-b618-7c69-b5f6-9036b7027fca" xlink:href="ueic-20260331.xsd#ueic_UsBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_019d2ef6-b618-7bba-bda2-dc559bf1f2bc" xlink:to="loc_ueic_UsBankMember_019d2ef6-b618-7c69-b5f6-9036b7027fca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_NationalInterbankMember_019d2ef6-ea08-76cf-af4a-6bb460e0d6d7" xlink:href="ueic-20260331.xsd#ueic_NationalInterbankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_019d2ef6-b618-7bba-bda2-dc559bf1f2bc" xlink:to="loc_ueic_NationalInterbankMember_019d2ef6-ea08-76cf-af4a-6bb460e0d6d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019d2ef6-9ed9-7522-801f-60a736c827d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019d2ef6-9ed9-7522-801f-60a736c827d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_LineOfCreditFacilityBorrowingBasePercentage_019d2ef6-9ed9-70f4-a26b-cc825376f22e" xlink:href="ueic-20260331.xsd#ueic_LineOfCreditFacilityBorrowingBasePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_ueic_LineOfCreditFacilityBorrowingBasePercentage_019d2ef6-9ed9-70f4-a26b-cc825376f22e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019d2ef6-9ed9-73d3-b6a5-04427ad4e6ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019d2ef6-9ed9-73d3-b6a5-04427ad4e6ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_019d2ef6-9ed9-71c0-9f95-3f965288bb8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_019d2ef6-9ed9-71c0-9f95-3f965288bb8a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019d2ef6-b618-7567-9fd1-ffdf971b1517" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019d2ef6-b618-7567-9fd1-ffdf971b1517" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration_019d2ef6-b618-789f-acc1-068f232bc67a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019d2ef6-b618-7567-9fd1-ffdf971b1517" xlink:to="loc_us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration_019d2ef6-b618-789f-acc1-068f232bc67a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019d2ef6-b618-72b2-a158-ea20484a7d17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019d2ef6-b618-72b2-a158-ea20484a7d17" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019d2ef6-b618-79c0-af7a-a8cf3c473ada" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019d2ef6-b618-79c0-af7a-a8cf3c473ada" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_LineOfCreditFacilityMaximumRestrictedPayments_019d2ef6-cd09-747e-8164-9ee049fe595e" xlink:href="ueic-20260331.xsd#ueic_LineOfCreditFacilityMaximumRestrictedPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_ueic_LineOfCreditFacilityMaximumRestrictedPayments_019d2ef6-cd09-747e-8164-9ee049fe595e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019d2ef6-9ed9-7568-a296-e6ab9c32cdab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_us-gaap_LineOfCredit_019d2ef6-9ed9-7568-a296-e6ab9c32cdab" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseShortTermBorrowings_019d2ef6-cd0a-7cc3-bccf-daddcaadbe96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_us-gaap_InterestExpenseShortTermBorrowings_019d2ef6-cd0a-7cc3-bccf-daddcaadbe96" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_DebtInstrumentFacilityFeeExpense_019d2ef6-cd0a-7f80-b383-2cdbbc649103" xlink:href="ueic-20260331.xsd#ueic_DebtInstrumentFacilityFeeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_ueic_DebtInstrumentFacilityFeeExpense_019d2ef6-cd0a-7f80-b383-2cdbbc649103" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_019d2ef6-ea08-735d-aa69-6900d8e38d77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_019d2ef6-ea08-735d-aa69-6900d8e38d77" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LinesOfCreditCurrent_019d2ef6-cd0a-708a-9ef3-8a3fbc9404dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LinesOfCreditCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019d2ef6-9ed9-7721-ad71-dc4c96a6ffce" xlink:to="loc_us-gaap_LinesOfCreditCurrent_019d2ef6-cd0a-708a-9ef3-8a3fbc9404dc" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/AccruedCompensationDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#AccruedCompensationDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/AccruedCompensationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ueic_AccruedLiabilitiesCurrentLineItems_019dbe6b-8b6c-7827-9ce3-c4a87a75cb39" xlink:href="ueic-20260331.xsd#ueic_AccruedLiabilitiesCurrentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_AccruedLiabilitiesCurrentTable_019dbe6b-8b6c-7397-b74e-76287209d22c" xlink:href="ueic-20260331.xsd#ueic_AccruedLiabilitiesCurrentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ueic_AccruedLiabilitiesCurrentLineItems_019dbe6b-8b6c-7827-9ce3-c4a87a75cb39" xlink:to="loc_ueic_AccruedLiabilitiesCurrentTable_019dbe6b-8b6c-7397-b74e-76287209d22c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_019dbe6b-8b6c-745f-a545-dc028f2a7092" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ueic_AccruedLiabilitiesCurrentTable_019dbe6b-8b6c-7397-b74e-76287209d22c" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_019dbe6b-8b6c-745f-a545-dc028f2a7092" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019dbe6b-8b6c-745f-a545-dc028f2a7092_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019dbe6b-8b6c-745f-a545-dc028f2a7092" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019dbe6b-8b6c-745f-a545-dc028f2a7092_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019dbe6b-8b6c-7bf1-8329-4f766bbf4c1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019dbe6b-8b6c-745f-a545-dc028f2a7092" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019dbe6b-8b6c-7bf1-8329-4f766bbf4c1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_019dbe6b-8b6c-72dc-bce7-6a24f81057b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019dbe6b-8b6c-7bf1-8329-4f766bbf4c1f" xlink:to="loc_us-gaap_EmployeeSeveranceMember_019dbe6b-8b6c-72dc-bce7-6a24f81057b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019dbe6b-8b6c-721b-b576-6433a01da346" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ueic_AccruedLiabilitiesCurrentTable_019dbe6b-8b6c-7397-b74e-76287209d22c" xlink:to="loc_us-gaap_RestructuringPlanAxis_019dbe6b-8b6c-721b-b576-6433a01da346" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dbe6b-8b6c-721b-b576-6433a01da346_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dbe6b-8b6c-721b-b576-6433a01da346" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dbe6b-8b6c-721b-b576-6433a01da346_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dbe6b-8b6c-74ad-be34-ca17e4e2be15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dbe6b-8b6c-721b-b576-6433a01da346" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dbe6b-8b6c-74ad-be34-ca17e4e2be15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_RestructuringPlan2025Member_019dbe6b-8b6c-74c4-a44c-5996cb63b766" xlink:href="ueic-20260331.xsd#ueic_RestructuringPlan2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019dbe6b-8b6c-74ad-be34-ca17e4e2be15" xlink:to="loc_ueic_RestructuringPlan2025Member_019dbe6b-8b6c-74c4-a44c-5996cb63b766" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedBonusesCurrent_019cfdbd-9605-7aed-a1e0-157c9dfafa7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedBonusesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_AccruedLiabilitiesCurrentLineItems_019dbe6b-8b6c-7827-9ce3-c4a87a75cb39" xlink:to="loc_us-gaap_AccruedBonusesCurrent_019cfdbd-9605-7aed-a1e0-157c9dfafa7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_AccruedEmployeeSalesCommissionCurrent_019cfdbd-9605-74e3-ba1a-cb5b6ec38d1c" xlink:href="ueic-20260331.xsd#ueic_AccruedEmployeeSalesCommissionCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_AccruedLiabilitiesCurrentLineItems_019dbe6b-8b6c-7827-9ce3-c4a87a75cb39" xlink:to="loc_ueic_AccruedEmployeeSalesCommissionCurrent_019cfdbd-9605-74e3-ba1a-cb5b6ec38d1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedSalariesCurrent_019cfdbd-9605-7857-bfc5-c0966a4d5fac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedSalariesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_AccruedLiabilitiesCurrentLineItems_019dbe6b-8b6c-7827-9ce3-c4a87a75cb39" xlink:to="loc_us-gaap_AccruedSalariesCurrent_019cfdbd-9605-7857-bfc5-c0966a4d5fac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_AccruedSocialInsuranceCurrent_019cfdbd-9605-7cac-9d5e-d59268497f8c" xlink:href="ueic-20260331.xsd#ueic_AccruedSocialInsuranceCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_AccruedLiabilitiesCurrentLineItems_019dbe6b-8b6c-7827-9ce3-c4a87a75cb39" xlink:to="loc_ueic_AccruedSocialInsuranceCurrent_019cfdbd-9605-7cac-9d5e-d59268497f8c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedVacationCurrent_019cfdbd-9605-70af-a45a-4bb2c862658d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedVacationCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_AccruedLiabilitiesCurrentLineItems_019dbe6b-8b6c-7827-9ce3-c4a87a75cb39" xlink:to="loc_us-gaap_AccruedVacationCurrent_019cfdbd-9605-70af-a45a-4bb2c862658d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherEmployeeRelatedLiabilitiesCurrent_019cfdbd-9605-7c2e-9005-6b4e92573a89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherEmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_AccruedLiabilitiesCurrentLineItems_019dbe6b-8b6c-7827-9ce3-c4a87a75cb39" xlink:to="loc_us-gaap_OtherEmployeeRelatedLiabilitiesCurrent_019cfdbd-9605-7c2e-9005-6b4e92573a89" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_019cfdbd-9605-7d44-ba33-76c5d734ad0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_AccruedLiabilitiesCurrentLineItems_019dbe6b-8b6c-7827-9ce3-c4a87a75cb39" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_019cfdbd-9605-7d44-ba33-76c5d734ad0e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_AccruedSeveranceCurrent_019dbe6b-8b6c-78b3-9071-209e56ea488a" xlink:href="ueic-20260331.xsd#ueic_AccruedSeveranceCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_AccruedLiabilitiesCurrentLineItems_019dbe6b-8b6c-7827-9ce3-c4a87a75cb39" xlink:to="loc_ueic_AccruedSeveranceCurrent_019dbe6b-8b6c-78b3-9071-209e56ea488a" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/CommitmentsandContingenciesScheduleofNoncancellablePurchaseCommitmentsDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#CommitmentsandContingenciesScheduleofNoncancellablePurchaseCommitmentsDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/CommitmentsandContingenciesScheduleofNoncancellablePurchaseCommitmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ueic_ContingenciesLineItems_019cfdbd-9606-7bfd-ba4e-b24fd44cd448" xlink:href="ueic-20260331.xsd#ueic_ContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_ContingenciesTable_019cfdbd-9606-7d27-83ef-8000a2a3f58f" xlink:href="ueic-20260331.xsd#ueic_ContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ueic_ContingenciesLineItems_019cfdbd-9606-7bfd-ba4e-b24fd44cd448" xlink:to="loc_ueic_ContingenciesTable_019cfdbd-9606-7d27-83ef-8000a2a3f58f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis_019cfdbd-9606-7dac-8adc-7e8857af3163" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ueic_ContingenciesTable_019cfdbd-9606-7d27-83ef-8000a2a3f58f" xlink:to="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis_019cfdbd-9606-7dac-8adc-7e8857af3163" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019cfdbd-9606-7dac-8adc-7e8857af3163_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis_019cfdbd-9606-7dac-8adc-7e8857af3163" xlink:to="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019cfdbd-9606-7dac-8adc-7e8857af3163_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019cfdbd-9606-7c6f-88db-bf7f294fd4b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis_019cfdbd-9606-7dac-8adc-7e8857af3163" xlink:to="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019cfdbd-9606-7c6f-88db-bf7f294fd4b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoriesMember_019cfdbd-9606-7a03-9545-612462008a25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019cfdbd-9606-7c6f-88db-bf7f294fd4b2" xlink:to="loc_us-gaap_InventoriesMember_019cfdbd-9606-7a03-9545-612462008a25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentMember_019cfdbd-9606-79de-b1d1-01ca694a12b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019cfdbd-9606-7c6f-88db-bf7f294fd4b2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentMember_019cfdbd-9606-79de-b1d1-01ca694a12b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_019cfdbd-9606-765a-a3a7-e937de7cbee7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_ContingenciesLineItems_019cfdbd-9606-7bfd-ba4e-b24fd44cd448" xlink:to="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_019cfdbd-9606-765a-a3a7-e937de7cbee7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ueic_ContingenciesLineItems_019dbe63-13ba-7e70-8d0b-709d9f0203b5" xlink:href="ueic-20260331.xsd#ueic_ContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_ContingenciesTable_019cfdbd-9606-7abf-9ee2-0221f3aa97d8" xlink:href="ueic-20260331.xsd#ueic_ContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ueic_ContingenciesLineItems_019dbe63-13ba-7e70-8d0b-709d9f0203b5" xlink:to="loc_ueic_ContingenciesTable_019cfdbd-9606-7abf-9ee2-0221f3aa97d8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019dd475-800a-7a6e-b9da-e7e2df1f0b73" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ueic_ContingenciesTable_019cfdbd-9606-7abf-9ee2-0221f3aa97d8" xlink:to="loc_srt_StatementGeographicalAxis_019dd475-800a-7a6e-b9da-e7e2df1f0b73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019dd475-800a-7a6e-b9da-e7e2df1f0b73_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019dd475-800a-7a6e-b9da-e7e2df1f0b73" xlink:to="loc_srt_SegmentGeographicalDomain_019dd475-800a-7a6e-b9da-e7e2df1f0b73_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019dd475-800a-7558-b30d-5fd285f2777a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019dd475-800a-7a6e-b9da-e7e2df1f0b73" xlink:to="loc_srt_SegmentGeographicalDomain_019dd475-800a-7558-b30d-5fd285f2777a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MX_019dd475-800a-7c36-9996-d65ef9bdd415" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_MX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019dd475-800a-7558-b30d-5fd285f2777a" xlink:to="loc_country_MX_019dd475-800a-7c36-9996-d65ef9bdd415" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019dd475-800a-7ce4-a61d-095eefa24bc6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ueic_ContingenciesTable_019cfdbd-9606-7abf-9ee2-0221f3aa97d8" xlink:to="loc_us-gaap_RestructuringPlanAxis_019dd475-800a-7ce4-a61d-095eefa24bc6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dd475-800a-7ce4-a61d-095eefa24bc6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dd475-800a-7ce4-a61d-095eefa24bc6" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dd475-800a-7ce4-a61d-095eefa24bc6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dd475-800a-700e-9f72-bf39c6e04749" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dd475-800a-7ce4-a61d-095eefa24bc6" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dd475-800a-700e-9f72-bf39c6e04749" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_RestructuringPlan20232024Member_019dd475-800a-7434-83f1-fcfcfbb93abc" xlink:href="ueic-20260331.xsd#ueic_RestructuringPlan20232024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019dd475-800a-700e-9f72-bf39c6e04749" xlink:to="loc_ueic_RestructuringPlan20232024Member_019dd475-800a-7434-83f1-fcfcfbb93abc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_019dd475-a133-7362-b03f-cad021fa2fa2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ueic_ContingenciesTable_019cfdbd-9606-7abf-9ee2-0221f3aa97d8" xlink:to="loc_srt_LitigationCaseAxis_019dd475-a133-7362-b03f-cad021fa2fa2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019dd475-a133-7362-b03f-cad021fa2fa2_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_019dd475-a133-7362-b03f-cad021fa2fa2" xlink:to="loc_srt_LitigationCaseTypeDomain_019dd475-a133-7362-b03f-cad021fa2fa2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019dd475-a133-74a8-9770-2f777b95ceb7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_019dd475-a133-7362-b03f-cad021fa2fa2" xlink:to="loc_srt_LitigationCaseTypeDomain_019dd475-a133-74a8-9770-2f777b95ceb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_RokuMatterMember_019dd475-a133-7d2c-b43f-c74e826815d5" xlink:href="ueic-20260331.xsd#ueic_RokuMatterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_019dd475-a133-74a8-9770-2f777b95ceb7" xlink:to="loc_ueic_RokuMatterMember_019dd475-a133-7d2c-b43f-c74e826815d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_019dd475-800a-7602-b961-3910abac3392" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_ContingenciesLineItems_019dbe63-13ba-7e70-8d0b-709d9f0203b5" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_019dd475-800a-7602-b961-3910abac3392" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveCurrent_019dda99-93cd-759f-b9f9-26711f37b79d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserveCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_ContingenciesLineItems_019dbe63-13ba-7e70-8d0b-709d9f0203b5" xlink:to="loc_us-gaap_RestructuringReserveCurrent_019dda99-93cd-759f-b9f9-26711f37b79d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyClaimsSettledNumber_019dd475-a133-77d6-8ef7-54a3d2a3eba1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyClaimsSettledNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_ContingenciesLineItems_019dbe63-13ba-7e70-8d0b-709d9f0203b5" xlink:to="loc_us-gaap_LossContingencyClaimsSettledNumber_019dd475-a133-77d6-8ef7-54a3d2a3eba1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyPendingClaimsNumber_019dd475-c636-79e2-97ff-179357b8acb6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyPendingClaimsNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_ContingenciesLineItems_019dbe63-13ba-7e70-8d0b-709d9f0203b5" xlink:to="loc_us-gaap_LossContingencyPendingClaimsNumber_019dd475-c636-79e2-97ff-179357b8acb6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyPatentsAllegedlyInfringedNumber_019dd475-c636-7401-9c43-d9efd049c723" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyPatentsAllegedlyInfringedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ueic_ContingenciesLineItems_019dbe63-13ba-7e70-8d0b-709d9f0203b5" xlink:to="loc_us-gaap_LossContingencyPatentsAllegedlyInfringedNumber_019dd475-c636-7401-9c43-d9efd049c723" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/TreasuryStockNarrativeDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#TreasuryStockNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/TreasuryStockNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019cfdbd-9606-7980-a133-010e04eefba1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityClassOfTreasuryStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfTreasuryStockTable_019cfdbd-9606-799c-b199-8c4e5334a056" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfTreasuryStockTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019cfdbd-9606-7980-a133-010e04eefba1" xlink:to="loc_us-gaap_ClassOfTreasuryStockTable_019cfdbd-9606-799c-b199-8c4e5334a056" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019cfdbd-9606-799f-a9d8-7bc581ebfa30" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_019cfdbd-9606-799c-b199-8c4e5334a056" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019cfdbd-9606-799f-a9d8-7bc581ebfa30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019cfdbd-9606-799f-a9d8-7bc581ebfa30_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019cfdbd-9606-799f-a9d8-7bc581ebfa30" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019cfdbd-9606-799f-a9d8-7bc581ebfa30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019cfdbd-9606-7850-aa22-4b0f5ee7147c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019cfdbd-9606-799f-a9d8-7bc581ebfa30" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019cfdbd-9606-7850-aa22-4b0f5ee7147c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_October2023ShareRepurchaseProgramMember_019cfdbd-9606-7661-bba8-0d450edd3202" xlink:href="ueic-20260331.xsd#ueic_October2023ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019cfdbd-9606-7850-aa22-4b0f5ee7147c" xlink:to="loc_ueic_October2023ShareRepurchaseProgramMember_019cfdbd-9606-7661-bba8-0d450edd3202" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_019cfdbd-9606-7671-8012-b2aee9dbcef3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019cfdbd-9606-7980-a133-010e04eefba1" xlink:to="loc_srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_019cfdbd-9606-7671-8012-b2aee9dbcef3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_019cfdbd-9606-7020-be16-a206e8daa969" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019cfdbd-9606-7980-a133-010e04eefba1" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_019cfdbd-9606-7020-be16-a206e8daa969" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_ShareRepurchaseProgramIncreaseDecreaseInNumberOfAuthorizedShares_019dbba7-43db-7142-9ed9-553362223c29" xlink:href="ueic-20260331.xsd#ueic_ShareRepurchaseProgramIncreaseDecreaseInNumberOfAuthorizedShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019cfdbd-9606-7980-a133-010e04eefba1" xlink:to="loc_ueic_ShareRepurchaseProgramIncreaseDecreaseInNumberOfAuthorizedShares_019dbba7-43db-7142-9ed9-553362223c29" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased_019cfdbd-9606-7d0c-9135-536252554155" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019cfdbd-9606-7980-a133-010e04eefba1" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased_019cfdbd-9606-7d0c-9135-536252554155" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/TreasuryStockScheduleofRepurchasedSharesofCommonStockDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#TreasuryStockScheduleofRepurchasedSharesofCommonStockDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/TreasuryStockScheduleofRepurchasedSharesofCommonStockDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019cfdbd-9606-75e5-ad93-e9314d2b70fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityClassOfTreasuryStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfTreasuryStockTable_019cfdbd-9606-7b0c-9c35-059d6b3c5da7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfTreasuryStockTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019cfdbd-9606-75e5-ad93-e9314d2b70fa" xlink:to="loc_us-gaap_ClassOfTreasuryStockTable_019cfdbd-9606-7b0c-9c35-059d6b3c5da7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019cfdbd-9606-7c5d-aace-a8b784be0380" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_019cfdbd-9606-7b0c-9c35-059d6b3c5da7" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019cfdbd-9606-7c5d-aace-a8b784be0380" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019cfdbd-9606-7c5d-aace-a8b784be0380_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019cfdbd-9606-7c5d-aace-a8b784be0380" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019cfdbd-9606-7c5d-aace-a8b784be0380_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019cfdbd-9606-7fbe-bcf7-80c1a199a678" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019cfdbd-9606-7c5d-aace-a8b784be0380" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019cfdbd-9606-7fbe-bcf7-80c1a199a678" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_OpenMarketShareRepurchaseMember_019cfdbd-9606-7e58-aa0a-f7b9c3ea1ef0" xlink:href="ueic-20260331.xsd#ueic_OpenMarketShareRepurchaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019cfdbd-9606-7fbe-bcf7-80c1a199a678" xlink:to="loc_ueic_OpenMarketShareRepurchaseMember_019cfdbd-9606-7e58-aa0a-f7b9c3ea1ef0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_StockBasedCompensationShareRepurchaseMember_019cfdbd-9606-7185-886d-cbb034b5aab5" xlink:href="ueic-20260331.xsd#ueic_StockBasedCompensationShareRepurchaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019cfdbd-9606-7fbe-bcf7-80c1a199a678" xlink:to="loc_ueic_StockBasedCompensationShareRepurchaseMember_019cfdbd-9606-7185-886d-cbb034b5aab5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019cfdbd-9606-7109-99e8-7fb018c9ead1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019cfdbd-9606-75e5-ad93-e9314d2b70fa" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019cfdbd-9606-7109-99e8-7fb018c9ead1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019cfdbd-9606-7aca-9fe3-f646044a6ac5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_019cfdbd-9606-75e5-ad93-e9314d2b70fa" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019cfdbd-9606-7aca-9fe3-f646044a6ac5" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/StockBasedCompensationScheduleofStockBasedCompensationExpenseandRelatedIncomeTaxBenefitDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#StockBasedCompensationScheduleofStockBasedCompensationExpenseandRelatedIncomeTaxBenefitDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/StockBasedCompensationScheduleofStockBasedCompensationExpenseandRelatedIncomeTaxBenefitDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019cfdbd-9606-7755-b961-9848bcf8f365" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019cfdbd-9606-762b-a3b4-d47fccd253c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019cfdbd-9606-7755-b961-9848bcf8f365" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019cfdbd-9606-762b-a3b4-d47fccd253c0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019cfdbd-9606-74b8-917d-4a1bebc4e502" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019cfdbd-9606-762b-a3b4-d47fccd253c0" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019cfdbd-9606-74b8-917d-4a1bebc4e502" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9606-74b8-917d-4a1bebc4e502_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019cfdbd-9606-74b8-917d-4a1bebc4e502" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9606-74b8-917d-4a1bebc4e502_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9606-741b-be8d-fe94ad33cd67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019cfdbd-9606-74b8-917d-4a1bebc4e502" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9606-741b-be8d-fe94ad33cd67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_019cfdbd-9606-728e-a9c7-0a2157a84a56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9606-741b-be8d-fe94ad33cd67" xlink:to="loc_us-gaap_CostOfSalesMember_019cfdbd-9606-728e-a9c7-0a2157a84a56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_019cfdbd-9606-7fde-ac1c-6aa758d56d29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9606-741b-be8d-fe94ad33cd67" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_019cfdbd-9606-7fde-ac1c-6aa758d56d29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_019cfdbd-9606-7905-8bb2-f192250a2cf3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019cfdbd-9606-741b-be8d-fe94ad33cd67" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_019cfdbd-9606-7905-8bb2-f192250a2cf3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusAxis_019cfdbd-9606-7cbb-9667-4ec140a01888" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019cfdbd-9606-762b-a3b4-d47fccd253c0" xlink:to="loc_us-gaap_GranteeStatusAxis_019cfdbd-9606-7cbb-9667-4ec140a01888" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_019cfdbd-9606-7cbb-9667-4ec140a01888_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GranteeStatusAxis_019cfdbd-9606-7cbb-9667-4ec140a01888" xlink:to="loc_us-gaap_GranteeStatusDomain_019cfdbd-9606-7cbb-9667-4ec140a01888_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_019cfdbd-9606-7893-b6e0-8fa39326ee20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GranteeStatusAxis_019cfdbd-9606-7cbb-9667-4ec140a01888" xlink:to="loc_us-gaap_GranteeStatusDomain_019cfdbd-9606-7893-b6e0-8fa39326ee20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_019cfdbd-9606-769c-80e2-d6ece83a3757" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedPaymentArrangementEmployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_019cfdbd-9606-7893-b6e0-8fa39326ee20" xlink:to="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_019cfdbd-9606-769c-80e2-d6ece83a3757" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedPaymentArrangementNonemployeeMember_019cfdbd-9606-7bdc-b1fe-7e17817d5f08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedPaymentArrangementNonemployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_019cfdbd-9606-7893-b6e0-8fa39326ee20" xlink:to="loc_us-gaap_ShareBasedPaymentArrangementNonemployeeMember_019cfdbd-9606-7bdc-b1fe-7e17817d5f08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019cfdbd-9606-7cc2-b1b1-a550386d1532" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019cfdbd-9606-7755-b961-9848bcf8f365" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019cfdbd-9606-7cc2-b1b1-a550386d1532" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019cfdbd-9606-7539-be65-b4bcac6d3be5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019cfdbd-9606-7755-b961-9848bcf8f365" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019cfdbd-9606-7539-be65-b4bcac6d3be5" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/StockBasedCompensationScheduleofNonVestedRestrictedStockAwardActivityDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#StockBasedCompensationScheduleofNonVestedRestrictedStockAwardActivityDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/StockBasedCompensationScheduleofNonVestedRestrictedStockAwardActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7fd9-b16b-43dad58a3a04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cfdbd-9606-7e66-944c-e889baad8951" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7fd9-b16b-43dad58a3a04" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cfdbd-9606-7e66-944c-e889baad8951" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cfdbd-9606-7489-9288-2a2e60e26eaa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cfdbd-9606-7e66-944c-e889baad8951" xlink:to="loc_us-gaap_AwardTypeAxis_019cfdbd-9606-7489-9288-2a2e60e26eaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-7489-9288-2a2e60e26eaa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019cfdbd-9606-7489-9288-2a2e60e26eaa" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-7489-9288-2a2e60e26eaa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-79e5-8bd9-6123b6f1dee7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019cfdbd-9606-7489-9288-2a2e60e26eaa" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-79e5-8bd9-6123b6f1dee7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019cfdbd-9606-75cc-9675-1e167cfe6666" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-79e5-8bd9-6123b6f1dee7" xlink:to="loc_us-gaap_RestrictedStockMember_019cfdbd-9606-75cc-9675-1e167cfe6666" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_019cfdbd-9606-794c-a23a-36f9f1806d8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-79e5-8bd9-6123b6f1dee7" xlink:to="loc_us-gaap_PerformanceSharesMember_019cfdbd-9606-794c-a23a-36f9f1806d8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019cfdbd-9606-7b43-8d07-b574a890438a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7fd9-b16b-43dad58a3a04" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019cfdbd-9606-7b43-8d07-b574a890438a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019cfdbd-9606-7341-8ba1-e976d16ac987" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019cfdbd-9606-7b43-8d07-b574a890438a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019cfdbd-9606-7341-8ba1-e976d16ac987" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019cfdbd-9606-762e-9d9c-04a2241f5c49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019cfdbd-9606-7b43-8d07-b574a890438a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019cfdbd-9606-762e-9d9c-04a2241f5c49" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019cfdbd-9606-7ddc-ac3b-75f8400a7c99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019cfdbd-9606-7b43-8d07-b574a890438a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019cfdbd-9606-7ddc-ac3b-75f8400a7c99" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019cfdbd-9606-7d9c-b767-331a254e8de9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019cfdbd-9606-7b43-8d07-b574a890438a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019cfdbd-9606-7d9c-b767-331a254e8de9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019cfdbd-9606-7601-8b45-1b1261d4b013" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019cfdbd-9606-7c4a-bda8-eface4161089" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7fd9-b16b-43dad58a3a04" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019cfdbd-9606-7c4a-bda8-eface4161089" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019cfdbd-9606-77ae-90c9-0a7f74a754c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019cfdbd-9606-7c4a-bda8-eface4161089" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019cfdbd-9606-77ae-90c9-0a7f74a754c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019cfdbd-9606-7601-84c7-553dac4d569b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019cfdbd-9606-7c4a-bda8-eface4161089" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019cfdbd-9606-7601-84c7-553dac4d569b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019cfdbd-9606-7e8f-80f0-934a9aa4c96e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019cfdbd-9606-7c4a-bda8-eface4161089" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019cfdbd-9606-7e8f-80f0-934a9aa4c96e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019cfdbd-9606-7d80-b705-421d675054c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019cfdbd-9606-7c4a-bda8-eface4161089" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019cfdbd-9606-7d80-b705-421d675054c8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019cfdbd-9606-77d5-818d-28e38c4c2f2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/StockBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#StockBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7c8e-b8fd-a90256afaa8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cfdbd-9606-7f44-ab4d-c99a072b39d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7c8e-b8fd-a90256afaa8b" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cfdbd-9606-7f44-ab4d-c99a072b39d1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cfdbd-9606-76da-a220-80d5b830bd8f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cfdbd-9606-7f44-ab4d-c99a072b39d1" xlink:to="loc_us-gaap_AwardTypeAxis_019cfdbd-9606-76da-a220-80d5b830bd8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-76da-a220-80d5b830bd8f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019cfdbd-9606-76da-a220-80d5b830bd8f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-76da-a220-80d5b830bd8f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-79f1-aa87-f8eab3d8222a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019cfdbd-9606-76da-a220-80d5b830bd8f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-79f1-aa87-f8eab3d8222a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019cfdbd-9606-7347-9193-df714709b342" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-79f1-aa87-f8eab3d8222a" xlink:to="loc_us-gaap_RestrictedStockMember_019cfdbd-9606-7347-9193-df714709b342" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_019cfdbd-9606-7430-9692-fde2c0f64c08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-79f1-aa87-f8eab3d8222a" xlink:to="loc_us-gaap_PerformanceSharesMember_019cfdbd-9606-7430-9692-fde2c0f64c08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019cfdbd-9606-7b4f-903b-9f5386581e21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-79f1-aa87-f8eab3d8222a" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019cfdbd-9606-7b4f-903b-9f5386581e21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019cfdbd-9606-71f3-9ca0-cd5380c3ee95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7c8e-b8fd-a90256afaa8b" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019cfdbd-9606-71f3-9ca0-cd5380c3ee95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019cfdbd-9606-76da-b32f-3b7a534a1205" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7c8e-b8fd-a90256afaa8b" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019cfdbd-9606-76da-b32f-3b7a534a1205" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/StockBasedCompensationScheduleofShareBasedCompensationArrangementsbyShareBasedPaymentAwardDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#StockBasedCompensationScheduleofShareBasedCompensationArrangementsbyShareBasedPaymentAwardDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/StockBasedCompensationScheduleofShareBasedCompensationArrangementsbyShareBasedPaymentAwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7c45-8869-5ed5535aec19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cfdbd-9606-77fe-bdc9-52749d53fffc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7c45-8869-5ed5535aec19" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cfdbd-9606-77fe-bdc9-52749d53fffc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cfdbd-9606-7659-a6ea-32da5310fd7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cfdbd-9606-77fe-bdc9-52749d53fffc" xlink:to="loc_us-gaap_AwardTypeAxis_019cfdbd-9606-7659-a6ea-32da5310fd7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-7659-a6ea-32da5310fd7b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019cfdbd-9606-7659-a6ea-32da5310fd7b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-7659-a6ea-32da5310fd7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-7f84-8816-bf97223fd792" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019cfdbd-9606-7659-a6ea-32da5310fd7b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-7f84-8816-bf97223fd792" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_019cfdbd-9606-785a-848d-7565d78647cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cfdbd-9606-7f84-8816-bf97223fd792" xlink:to="loc_us-gaap_PerformanceSharesMember_019cfdbd-9606-785a-848d-7565d78647cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019cfdbd-9606-7c73-addc-a2c5eff06985" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7c45-8869-5ed5535aec19" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019cfdbd-9606-7c73-addc-a2c5eff06985" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_019cfdbd-9606-78f6-94c1-e5bad54f2f98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7c45-8869-5ed5535aec19" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_019cfdbd-9606-78f6-94c1-e5bad54f2f98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_019cfdbd-9606-79ed-bb27-c1a5a2deaa26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7c45-8869-5ed5535aec19" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_019cfdbd-9606-79ed-bb27-c1a5a2deaa26" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019cfdbd-9606-74db-bb20-827203ec6cca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cfdbd-9606-7c45-8869-5ed5535aec19" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019cfdbd-9606-74db-bb20-827203ec6cca" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/EarningsLossPerShareScheduleofSecuritiesExcludedfromtheComputationofDilutedEarningsPerCommonShareDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#EarningsLossPerShareScheduleofSecuritiesExcludedfromtheComputationofDilutedEarningsPerCommonShareDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/EarningsLossPerShareScheduleofSecuritiesExcludedfromtheComputationofDilutedEarningsPerCommonShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019cfdbd-96b6-78da-bce8-5799851401ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019cfdbd-96b6-71df-bdf0-a67768007b56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019cfdbd-96b6-78da-bce8-5799851401ad" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019cfdbd-96b6-71df-bdf0-a67768007b56" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019cfdbd-96b6-73fa-a3d1-8cd359dd0abf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019cfdbd-96b6-71df-bdf0-a67768007b56" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019cfdbd-96b6-73fa-a3d1-8cd359dd0abf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cfdbd-96b6-73fa-a3d1-8cd359dd0abf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019cfdbd-96b6-73fa-a3d1-8cd359dd0abf" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cfdbd-96b6-73fa-a3d1-8cd359dd0abf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cfdbd-96b6-7b29-9259-dbefb2adc522" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019cfdbd-96b6-73fa-a3d1-8cd359dd0abf" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cfdbd-96b6-7b29-9259-dbefb2adc522" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019cfdbd-96b6-703e-bb6b-66837a00114f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cfdbd-96b6-7b29-9259-dbefb2adc522" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019cfdbd-96b6-703e-bb6b-66837a00114f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019cfdbd-96b6-76f1-bf18-1dea9854579d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cfdbd-96b6-7b29-9259-dbefb2adc522" xlink:to="loc_us-gaap_RestrictedStockMember_019cfdbd-96b6-76f1-bf18-1dea9854579d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_019cfdbd-96b6-73df-8a7a-48aaf6e2bcc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cfdbd-96b6-7b29-9259-dbefb2adc522" xlink:to="loc_us-gaap_PerformanceSharesMember_019cfdbd-96b6-73df-8a7a-48aaf6e2bcc9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019cfdbd-96b6-70a1-a1a2-df674ac0a588" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019cfdbd-96b6-78da-bce8-5799851401ad" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019cfdbd-96b6-70a1-a1a2-df674ac0a588" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/DerivativesScheduleofTotalNetFairValueofDerivativesDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#DerivativesScheduleofTotalNetFairValueofDerivativesDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/DerivativesScheduleofTotalNetFairValueofDerivativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_019cfdbd-96b6-7bfb-878a-cc4d6dcd9c84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019cfdbd-96b6-7ea1-9c07-b77859862522" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019cfdbd-96b6-7bfb-878a-cc4d6dcd9c84" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019cfdbd-96b6-7ea1-9c07-b77859862522" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cfdbd-96b6-72f7-b2a3-b404e24d56ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019cfdbd-96b6-7ea1-9c07-b77859862522" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cfdbd-96b6-72f7-b2a3-b404e24d56ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cfdbd-96b6-72f7-b2a3-b404e24d56ff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cfdbd-96b6-72f7-b2a3-b404e24d56ff" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cfdbd-96b6-72f7-b2a3-b404e24d56ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cfdbd-96b6-7a41-8a3d-184b51550ac9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cfdbd-96b6-72f7-b2a3-b404e24d56ff" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cfdbd-96b6-7a41-8a3d-184b51550ac9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019cfdbd-96b6-70e9-a979-293487849a1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cfdbd-96b6-7a41-8a3d-184b51550ac9" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019cfdbd-96b6-70e9-a979-293487849a1f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cfdbd-96b6-7096-be72-8a142e00168d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019cfdbd-96b6-7ea1-9c07-b77859862522" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cfdbd-96b6-7096-be72-8a142e00168d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cfdbd-96b6-7096-be72-8a142e00168d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cfdbd-96b6-7096-be72-8a142e00168d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cfdbd-96b6-7096-be72-8a142e00168d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cfdbd-96b6-7e77-87ac-33820be03baa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cfdbd-96b6-7096-be72-8a142e00168d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cfdbd-96b6-7e77-87ac-33820be03baa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019cfdbd-96b6-7bb6-b696-ea56257ac803" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cfdbd-96b6-7e77-87ac-33820be03baa" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019cfdbd-96b6-7bb6-b696-ea56257ac803" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019cfdbd-96b6-7623-bcf1-58cb8f46cdd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cfdbd-96b6-7e77-87ac-33820be03baa" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019cfdbd-96b6-7623-bcf1-58cb8f46cdd2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019cfdbd-96b6-7e6d-a999-6c47c1e65d0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cfdbd-96b6-7e77-87ac-33820be03baa" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019cfdbd-96b6-7e6d-a999-6c47c1e65d0d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfdbd-96b6-7e16-b767-38040f22095c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019cfdbd-96b6-7ea1-9c07-b77859862522" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfdbd-96b6-7e16-b767-38040f22095c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cfdbd-96b6-7e16-b767-38040f22095c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfdbd-96b6-7e16-b767-38040f22095c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cfdbd-96b6-7e16-b767-38040f22095c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cfdbd-96b6-7cc2-b558-7e0662d983cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfdbd-96b6-7e16-b767-38040f22095c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cfdbd-96b6-7cc2-b558-7e0662d983cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019cfdbd-96b6-7ebc-8e66-ce248c34723b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfdbd-96b6-7cc2-b558-7e0662d983cd" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019cfdbd-96b6-7ebc-8e66-ce248c34723b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019cfdbd-96b6-7b33-af71-0b899830c7e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019cfdbd-96b6-7ea1-9c07-b77859862522" xlink:to="loc_us-gaap_HedgingDesignationAxis_019cfdbd-96b6-7b33-af71-0b899830c7e3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7b33-af71-0b899830c7e3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cfdbd-96b6-7b33-af71-0b899830c7e3" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7b33-af71-0b899830c7e3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7592-bccc-82371f4a70c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cfdbd-96b6-7b33-af71-0b899830c7e3" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7592-bccc-82371f4a70c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019cfdbd-96b6-7a7a-9d0d-8b7aa0191aee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7592-bccc-82371f4a70c0" xlink:to="loc_us-gaap_NondesignatedMember_019cfdbd-96b6-7a7a-9d0d-8b7aa0191aee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_019cfdbd-96b6-7e88-b86b-a0116ecfedf3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019cfdbd-96b6-7bfb-878a-cc4d6dcd9c84" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_019cfdbd-96b6-7e88-b86b-a0116ecfedf3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/DerivativesNarrativeDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#DerivativesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/DerivativesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019cfdbd-96b6-79fa-aa03-cde2443e0a58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019cfdbd-96b6-7599-babe-2d27cdb29fd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019cfdbd-96b6-79fa-aa03-cde2443e0a58" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019cfdbd-96b6-7599-babe-2d27cdb29fd0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019cfdbd-96b6-7bd7-a89c-60adae8d6ac1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019cfdbd-96b6-7599-babe-2d27cdb29fd0" xlink:to="loc_us-gaap_HedgingDesignationAxis_019cfdbd-96b6-7bd7-a89c-60adae8d6ac1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7bd7-a89c-60adae8d6ac1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cfdbd-96b6-7bd7-a89c-60adae8d6ac1" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7bd7-a89c-60adae8d6ac1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7bb0-a01d-0b460275f06a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cfdbd-96b6-7bd7-a89c-60adae8d6ac1" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7bb0-a01d-0b460275f06a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019cfdbd-96b6-73bc-bf03-2f866026429a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7bb0-a01d-0b460275f06a" xlink:to="loc_us-gaap_NondesignatedMember_019cfdbd-96b6-73bc-bf03-2f866026429a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfdbd-96b6-739e-9196-8c48a6c1ef76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019cfdbd-96b6-7599-babe-2d27cdb29fd0" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfdbd-96b6-739e-9196-8c48a6c1ef76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cfdbd-96b6-739e-9196-8c48a6c1ef76_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfdbd-96b6-739e-9196-8c48a6c1ef76" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cfdbd-96b6-739e-9196-8c48a6c1ef76_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cfdbd-96b6-7f2c-8575-d837a7d6dacd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfdbd-96b6-739e-9196-8c48a6c1ef76" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cfdbd-96b6-7f2c-8575-d837a7d6dacd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019cfdbd-96b6-7b7d-b26b-731da2a36d15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfdbd-96b6-7f2c-8575-d837a7d6dacd" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019cfdbd-96b6-7b7d-b26b-731da2a36d15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019cfdbd-96b6-7d44-8fdf-bff3e4a6a090" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019cfdbd-96b6-79fa-aa03-cde2443e0a58" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019cfdbd-96b6-7d44-8fdf-bff3e4a6a090" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/DerivativesScheduleofForeignCurrencyExchangeContractsDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#DerivativesScheduleofForeignCurrencyExchangeContractsDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/DerivativesScheduleofForeignCurrencyExchangeContractsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019cfdbd-96b6-706f-83f4-0a65560e28e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019cfdbd-96b6-7c50-90c7-507ec7818c43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019cfdbd-96b6-706f-83f4-0a65560e28e4" xlink:to="loc_us-gaap_DerivativeTable_019cfdbd-96b6-7c50-90c7-507ec7818c43" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019cfdbd-96b6-759a-8322-a3b32065e55d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019cfdbd-96b6-7c50-90c7-507ec7818c43" xlink:to="loc_us-gaap_HedgingDesignationAxis_019cfdbd-96b6-759a-8322-a3b32065e55d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-759a-8322-a3b32065e55d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cfdbd-96b6-759a-8322-a3b32065e55d" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-759a-8322-a3b32065e55d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7c30-b85f-35f7a54d9d79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cfdbd-96b6-759a-8322-a3b32065e55d" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7c30-b85f-35f7a54d9d79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019cfdbd-96b6-70f1-bc8f-222b1a2e6566" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019cfdbd-96b6-7c30-b85f-35f7a54d9d79" xlink:to="loc_us-gaap_NondesignatedMember_019cfdbd-96b6-70f1-bc8f-222b1a2e6566" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis_019cfdbd-96b6-76f4-91b3-7c191ed976f5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CurrencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019cfdbd-96b6-7c50-90c7-507ec7818c43" xlink:to="loc_srt_CurrencyAxis_019cfdbd-96b6-76f4-91b3-7c191ed976f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019cfdbd-96b6-76f4-91b3-7c191ed976f5_default" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CurrencyAxis_019cfdbd-96b6-76f4-91b3-7c191ed976f5" xlink:to="loc_currency_AllCurrenciesDomain_019cfdbd-96b6-76f4-91b3-7c191ed976f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019cfdbd-96b6-7164-83e9-a20add909036" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CurrencyAxis_019cfdbd-96b6-76f4-91b3-7c191ed976f5" xlink:to="loc_currency_AllCurrenciesDomain_019cfdbd-96b6-7164-83e9-a20add909036" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_CNY_019cfdbd-96b6-7ac8-b86e-d9b667af37bb" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_CNY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_019cfdbd-96b6-7164-83e9-a20add909036" xlink:to="loc_currency_CNY_019cfdbd-96b6-7ac8-b86e-d9b667af37bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_EUR_019cfdbd-96b6-7cda-b267-98e95c515542" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_EUR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_019cfdbd-96b6-7164-83e9-a20add909036" xlink:to="loc_currency_EUR_019cfdbd-96b6-7cda-b267-98e95c515542" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_VND_019dbb9a-a426-7622-bebe-45dfef433f52" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_VND"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_019cfdbd-96b6-7164-83e9-a20add909036" xlink:to="loc_currency_VND_019dbb9a-a426-7622-bebe-45dfef433f52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019cfdbd-96b6-74f1-8e98-e6c543aef570" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cfdbd-96b6-706f-83f4-0a65560e28e4" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019cfdbd-96b6-74f1-8e98-e6c543aef570" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeForwardExchangeRate1_019cfdbd-96b6-7e6d-9861-97f255d74856" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeForwardExchangeRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cfdbd-96b6-706f-83f4-0a65560e28e4" xlink:to="loc_us-gaap_DerivativeForwardExchangeRate1_019cfdbd-96b6-7e6d-9861-97f255d74856" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019cfdbd-96b6-790a-9c79-0999ca114583" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cfdbd-96b6-706f-83f4-0a65560e28e4" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019cfdbd-96b6-790a-9c79-0999ca114583" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uei.com/role/ReportableSegmentDetails" xlink:type="simple" xlink:href="ueic-20260331.xsd#ReportableSegmentDetails"/>
  <link:definitionLink xlink:role="http://www.uei.com/role/ReportableSegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019cfdbd-96b6-7f9c-8062-4ff45ddfd6bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_019cfdbd-96b6-7cad-bd32-84e3af0e0f14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019cfdbd-96b6-7f9c-8062-4ff45ddfd6bd" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_019cfdbd-96b6-7cad-bd32-84e3af0e0f14" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019cfdbd-96b6-7b40-b1ca-aacd34365482" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_019cfdbd-96b6-7cad-bd32-84e3af0e0f14" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019cfdbd-96b6-7b40-b1ca-aacd34365482" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cfdbd-96b6-7b40-b1ca-aacd34365482_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cfdbd-96b6-7b40-b1ca-aacd34365482" xlink:to="loc_us-gaap_SegmentDomain_019cfdbd-96b6-7b40-b1ca-aacd34365482_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cfdbd-96b6-7653-a8be-c483f743144d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cfdbd-96b6-7b40-b1ca-aacd34365482" xlink:to="loc_us-gaap_SegmentDomain_019cfdbd-96b6-7653-a8be-c483f743144d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_ReportableSegmentMember_019cfdbd-96b6-7d69-bbd4-ed5bc72638ff" xlink:href="ueic-20260331.xsd#ueic_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cfdbd-96b6-7653-a8be-c483f743144d" xlink:to="loc_ueic_ReportableSegmentMember_019cfdbd-96b6-7d69-bbd4-ed5bc72638ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cfdbd-96b6-7927-a1af-6a107f69e48b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019cfdbd-96b6-7f9c-8062-4ff45ddfd6bd" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cfdbd-96b6-7927-a1af-6a107f69e48b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019cfdbd-96b6-7793-911f-cd3fca1ffb90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019cfdbd-96b6-7f9c-8062-4ff45ddfd6bd" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019cfdbd-96b6-7793-911f-cd3fca1ffb90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_SegmentReportingResearchAndDevelopmentExpenses_019cfdbd-96b6-7cf6-b98c-03ff5410c1d5" xlink:href="ueic-20260331.xsd#ueic_SegmentReportingResearchAndDevelopmentExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019cfdbd-96b6-7f9c-8062-4ff45ddfd6bd" xlink:to="loc_ueic_SegmentReportingResearchAndDevelopmentExpenses_019cfdbd-96b6-7cf6-b98c-03ff5410c1d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019cfdbd-96b6-7906-9493-7f978ae0720c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019cfdbd-96b6-7f9c-8062-4ff45ddfd6bd" xlink:to="loc_us-gaap_OperatingExpenses_019cfdbd-96b6-7906-9493-7f978ae0720c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019cfdbd-96b6-7c0a-bb95-0992ef2963b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019cfdbd-96b6-7f9c-8062-4ff45ddfd6bd" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019cfdbd-96b6-7c0a-bb95-0992ef2963b9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ueic_SegmentReportingNetIncomeLoss_019cfdbd-96b6-7a02-a2ef-d95ed5460b78" xlink:href="ueic-20260331.xsd#ueic_SegmentReportingNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019cfdbd-96b6-7f9c-8062-4ff45ddfd6bd" xlink:to="loc_ueic_SegmentReportingNetIncomeLoss_019cfdbd-96b6-7a02-a2ef-d95ed5460b78" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.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_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent" xlink:type="arc" order="41"/>
  </link:definitionLink>
</link:linkbase>
