verb
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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
- invalidation noun
- invalidator noun
Etymology
Origin of invalidate
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.
One doctor never examined her, while another barely spoke to her; either of these issues could invalidate competency declarations and expose medical misconduct, fraud and/or conspiracy.
From MarketWatch • Mar. 19, 2026
They say the new guidance violates multiple federal laws, including laws that govern federal spending and rule changes, and are asking the federal court to immediately invalidate the guidance as unlawful.
From Los Angeles Times • Mar. 16, 2026
US District Judge Royce Lamberth endorsed Revolution Wind's request to invalidate the US Interior Department's move to suspend the project off the coast of Rhode Island.
From Barron's • Jan. 12, 2026
In 2022, however, the American Journal of Therapeutics, which had published the study, warned that suspicious data “appears to invalidate the findings” regarding ivermectin’s potential to decrease deaths.
From Salon • Dec. 15, 2025
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.
