in·​val·​i·​date | \ (ˌ)in-ˈva-lə-ˌdāt How to pronounce invalidate (audio) \
invalidated; invalidating; invalidates

Definition of invalidate

transitive verb

: to make invalid especially : to weaken or destroy the cogency of

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Other Words from invalidate

invalidation \ (ˌ)in-​ˌva-​lə-​ˈdā-​shən How to pronounce invalidation (audio) \ noun
invalidator \ in-​ˈva-​lə-​ˌdā-​tər How to pronounce invalidator (audio) \ noun

Choose the Right Synonym for invalidate

nullify, negate, annul, abrogate, invalidate mean to deprive of effective or continued existence. nullify implies counteracting completely the force, effectiveness, or value of something. a penalty nullified the touchdown negate implies the destruction or canceling out of each of two things by the other. the arguments negate each other annul suggests making ineffective or nonexistent often by legal or official action. the treaty annuls all previous agreements abrogate is like annul but more definitely implies a legal or official act. a law to abrogate trading privileges invalidate implies making something powerless or unacceptable by declaration of its logical or moral or legal unsoundness. the court invalidated the statute

Examples of invalidate in a Sentence

actions that will invalidate the contract The study invalidates earlier theories. factors that may invalidate the test results
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Recent Examples on the Web While the decision doesn’t directly invalidate Ohio’s hospital transfer agreement requirement, some aspects of the case will affect Ohio, Sabrina Eaton and Laura Hancock report. cleveland, "Supreme Court’s Louisiana abortion case could have implications in Ohio: Capitol Letter," 30 June 2020 Election experts worry a prolonged outcome this year could set the stage for greater controversial – potentially attempts by candidates to invalidate the results – because of the raging fight over vote-by-mail. Joey Garrison, USA TODAY, "No presidential winner on election night? Mail-in ballots could put outcome in doubt for weeks," 28 June 2020 The Trump administration urged the Supreme Court to invalidate the Affordable Care Act in a legal brief filed Thursday, putting health care at center stage in an election year already focused on the coronavirus pandemic’s impact. Stephanie Armour, WSJ, "Trump Administration Asks Supreme Court to Invalidate Affordable Care Act," 26 June 2020 The Trump administration asked the Supreme Court late on Thursday to invalidate the Affordable Care Act, also known as Obamacare, despite thousands more Americans signing up since the pandemic began. Eliza Mackintosh, CNN, "What you need to know about coronavirus on Friday, June 26," 26 June 2020 How would Stephens have fared under President Trump’s recent rollback of transgender health protections (which the new ruling may invalidate)? Michael Schulman, The New Yorker, "The Three People at the Center of the Landmark Supreme Court Decision," 16 June 2020 But pollsters and analysts say that small technical criticisms do not invalidate the poll findings. Emily Larsen, Washington Examiner, "Trump cries of 'fake' polls more politics than legitimate criticism, analysts say," 12 June 2020 Attorney General Aaron Ford is urging a federal judge in Reno to deny an order sought by Calvary Chapel Dayton Valley to invalidate COVID-19 restrictions so up to 90 people can attend services at a time at the 200-capacity church southeast of Reno. USA TODAY, "Big Apple back in business, churches reopen, vaccine poll: News from around our 50 states," 9 June 2020 The group is asking the U.S. District Court for the District of Columbia to invalidate the whole of the order. Washington Post, "Welcome to The Technology 202, our guide to the intersection of technology and politics.," 2 June 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'invalidate.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of invalidate

1649, in the meaning defined above

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Time Traveler for invalidate

Time Traveler

The first known use of invalidate was in 1649

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Statistics for invalidate

Last Updated

5 Jul 2020

Cite this Entry

“Invalidate.” Dictionary, Merriam-Webster, Accessed 8 Jul. 2020.

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More Definitions for invalidate


How to pronounce invalidate (audio)

English Language Learners Definition of invalidate

: to weaken or destroy the effect of (something)
: to show or prove (something) to be false or incorrect


in·​val·​i·​date | \ in-ˈva-lə-ˌdāt How to pronounce invalidate (audio) \
invalidated; invalidating

Kids Definition of invalidate

: to weaken or destroy the effect of The phony signature invalidated the contract.


transitive verb
in·​val·​i·​date | \ in-ˈva-lə-ˌdāt How to pronounce invalidate (audio) \

Legal Definition of invalidate

: to make or declare invalid

Other Words from invalidate

invalidation \ in-​ˌva-​lə-​ˈdā-​shən How to pronounce invalidation (audio) \ noun

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