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

Other Words from invalidate

invalidation \ (ˌ)in-​ˌva-​lə-​ˈdā-​shən How to pronounce invalidate (audio) \ noun
invalidator \ in-​ˈva-​lə-​ˌdā-​tər How to pronounce invalidate (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 In a last ditch effort to overturn the election, Texas Attorney General Ken Paxton filed a lawsuit to invalidate electoral votes in Georgia, Michigan, Pennsylvania and Wisconsin. Chelsey Cox, USA TODAY, 17 Nov. 2021 Other experts said that absent any action by the courts or state and local officials to invalidate election results in predominantly Black or Latino communities, the Justice Department may not have grounds to investigate. Paul Egan, Detroit Free Press, 10 Aug. 2021 After years of negotiations ended in gridlock, Ramsey County leaders sued in 2019 asking the court to invalidate the joint powers agreement arguing, in part, that the city had failed to negotiate in good faith. Shannon Prather, Star Tribune, 18 June 2021 And Harris, like Biden, managed to connect the pandemic to the fate of the Affordable Care Act, which the Administration is currently trying to invalidate in court. Amy Davidson Sorkin, The New Yorker, 8 Oct. 2020 Griswold, the youngest secretary of state in the country, has been vocal on social media in condemning the Republican Party’s alleged attempts to invalidate the mail-in voting system in the lead up to the general election. Caitlin Mcfall, Fox News, 1 Oct. 2020 Hotel owners sued to invalidate the requirements in July. Roland Li,, 22 Sep. 2020 Chevron thenpushed to invalidate the 2011 ruling and charge Donziger with racketeering. Kate Aronoff, The New Republic, 1 Oct. 2021 And that doesn’t invalidate the fact that there was great art created, and OK, a lot of it was created by white people, and some of it was created by people who were racists. New York Times, 1 Oct. 2021

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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Last Updated

27 Nov 2021

Cite this Entry

“Invalidate.” Dictionary, Merriam-Webster, Accessed 1 Dec. 2021.

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More Definitions for invalidate



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 invalidate (audio) \ noun

More from Merriam-Webster on invalidate

Nglish: Translation of invalidate for Spanish Speakers

Britannica English: Translation of invalidate for Arabic Speakers


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