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

transitive verb

: to make invalid
especially : to weaken or destroy the cogency of
invalidation noun
invalidator 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
Recent Examples on the Web On the heels of that decision, the Supreme Court tossed out lower court rulings invalidating two separate federal firearms restrictions as applied to their individual challengers, as well as a lower court ruling that upheld provisions of a New York law. Melissa Quinn, CBS News, 2 July 2024 In 2021, a Chinese court invalidated the company’s patent following a challenge from a Chinese pharmaceutical company. Prarthana Prakash, Fortune Asia, 26 June 2024 The federal judge overseeing Donald Trump's classified documents case is hearing arguments today on the former president's effort to invalidate the appointment of special counsel Jack Smith. Katherine Faulders, ABC News, 21 June 2024 If the court invalidated the tax, the Justice Department warned, the government could lose $340 billion. Maureen Groppe, USA TODAY, 20 June 2024 See all Example Sentences for invalidate 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'invalidate.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1649, in the meaning defined above

Time Traveler
The first known use of invalidate was in 1649

Dictionary Entries Near invalidate

Cite this Entry

“Invalidate.” Dictionary, Merriam-Webster, Accessed 20 Jul. 2024.

Kids Definition


in·​val·​i·​date (ˈ)in-ˈval-ə-ˌdāt How to pronounce invalidate (audio)
: to weaken or destroy the effect of
evidence invalidating their claim
invalidation noun

Legal Definition


transitive verb
in·​val·​i·​date in-ˈva-lə-ˌdāt How to pronounce invalidate (audio)
: to make or declare invalid
invalidation noun

More from Merriam-Webster on invalidate

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