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 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 Some Sudanese people do not identify as Black, and my identity as Black does not invalidate their choice. Safia Elhillo, Harper's BAZAAR, 6 July 2021 The presence of a flawed image in a scientific study doesn’t necessarily invalidate its central observations. Ingfei Chen, The New Yorker, 23 June 2021 Giving more than one candidate the same ranking will invalidate not only that choice, but also any further rankings in that race. Ethan Cohen And Adam Levy, CNN, 22 June 2021 But the federal legislation would invalidate Michigan's law that only allows immediate family or household members to return a ballot on a voter's behalf. Clara Hendrickson, Detroit Free Press, 25 May 2021 If companies persist in enforcing them, the governments that approved the patents should simply invalidate them. Steven Salzberg, Forbes, 23 May 2021 In the coming months, the Supreme Court is expected to make a decision about the constitutionality of one provision of the Affordable Care Act—and could, in turn, decide to invalidate the entire law. Kate Ashford,, 10 Nov. 2020 Joyce has introduced a bill that would ensure that those with preexisting conditions are protected if courts invalidate the law. Sabrina Eaton, cleveland, 28 Oct. 2020 Trump is urging the Supreme Court to invalidate the law, an outcome that almost certainly would require her vote. Laura Litvan,, 13 Oct. 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

18 Jul 2021

Cite this Entry

“Invalidate.” Dictionary, Merriam-Webster, Accessed 25 Jul. 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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