Dictionary.com

invalidate

[ in-val-i-deyt ]
/ ɪnˈvæl ɪˌdeɪt /
Save This Word!
See synonyms for: invalidate / invalidated / invalidates / invalidating on Thesaurus.com

verb (used with object), in·val·i·dat·ed, in·val·i·dat·ing.
to render invalid; discredit.
to deprive of legal force or efficacy; nullify.
QUIZ
WILL YOU SAIL OR STUMBLE ON THESE GRAMMAR QUESTIONS?
Smoothly step over to these common grammar mistakes that trip many people up. Good luck!
Question 1 of 7
Fill in the blank: I can’t figure out _____ gave me this gift.

Origin of invalidate

First recorded in 1640–50; invalid2 + -ate1

OTHER WORDS FROM invalidate

in·val·i·da·tion, nounin·val·i·da·tor, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use invalidate in a sentence

British Dictionary definitions for invalidate

invalidate
/ (ɪnˈvælɪˌdeɪt) /

verb (tr)
to render weak or ineffective, as an argument
to take away the legal force or effectiveness of; annul, as a contract

Derived forms of invalidate

invalidation, nouninvalidator, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
FEEDBACK