verb in·val·i·date \ (ˌ)in-ˈva-lə-ˌdāt \
|Updated on: 14 Jul 2018

Definition of invalidate

invalidated; invalidating; invalidates
: to make invalid; especially : to weaken or destroy the cogency of


play \(ˌ)in-ˌva-lə-ˈdā-shən\ noun


play \in-ˈva-lə-ˌdā-tər\ noun

Examples of invalidate in a Sentence

  1. actions that will invalidate the contract

  2. The study invalidates earlier theories.

  3. factors that may invalidate the test results

Recent Examples of invalidate from the Web

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.

First Known Use of invalidate


in the meaning defined above

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Synonym Discussion of 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

INVALIDATE Defined for English Language Learners


Definition of invalidate for English Language Learners

  • : to weaken or destroy the effect of (something)

  • : to show or prove (something) to be false or incorrect

INVALIDATE Defined for Kids


verb in·val·i·date \ in-ˈva-lə-ˌdāt \

Definition of invalidate for Students

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

Law Dictionary


transitive verb in·val·i·date \ in-ˈva-lə-ˌdāt \

legal Definition of invalidate

: to make or declare invalid


play \in-ˌva-lə-ˈdā-shən\ noun

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one who attends or assists a leader

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