invalidate
Americanverb
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to render weak or ineffective, as an argument
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to take away the legal force or effectiveness of; annul, as a contract
Other Word Forms
Derived Forms
Conjugated Forms
Present
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have invalidatedperfect
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has invalidatedperfect 3rd person singular
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am invalidatingprogressive 1st person singular
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invalidatingparticiple
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have been invalidatingperfect progressive
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invalidatessingular 3rd person
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are invalidatingprogressive
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is invalidatingprogressive 3rd person singular
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has been invalidatingperfect progressive 3rd person singular
Past
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had invalidatedperfect
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had been invalidatingperfect progressive
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invalidatedparticiple
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invalidatedsimple
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were invalidatingprogressive plural
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was invalidatingprogressive singular
Future
Etymology
Origin of invalidate
Explanation
If administrators find out that students cheated on a test, the school might invalidate their class grades. To invalidate means to cancel something or make it void, as if it never happened. In invalidate you see the word valid which means true or correct. When you invalidate something you are making it less true, less official, or less correct. If you buy something that doesn't work properly and then try to fix it yourself, you invalidate the warranty. If you have a wacky theory that cars grow from trees, your teacher might invalidate your theory by taking you on a tour of an auto factory.
Vocabulary lists containing invalidate
Red Scarf Girl
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Vocabulary Video Contest (2013) - List 2
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Far from the Tree
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
At that time, Infantino suggested such a move could invalidate a country's World Cup hosting rights.
From BBC • Jun. 9, 2026
Rabo itself is suing some investors and seeking to invalidate claims asserted by the bankruptcy trustee.
From The Wall Street Journal • Jun. 7, 2026
Kavanaugh’s opinion is quite narrow; it merely identifies a procedural Batson violation and does not by itself invalidate Terry Pitchford’s death sentence.
From Slate • May 28, 2026
This does not invalidate gold or silver as long-term hedges.
From MarketWatch • Jan. 30, 2026
In general, I felt as if I couldn’t win, that no amount of faith or hard work would push me past my detractors and their attempts to invalidate me.
From "Becoming" by Michelle Obama
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
