UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ɪnˈvælɪdeɪt/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ɪnˈvælɪˌdeɪt/ ,USA pronunciation: respelling(in vali dāt′)

Inflections of 'invalidate' (v): (⇒ conjugate)
v 3rd person singular
v pres pverb, present participle: -ing verb used descriptively or to form progressive verb--for example, "a singing bird," "It is singing."
v pastverb, past simple: Past tense--for example, "He saw the man." "She laughed."
v past pverb, past participle: Verb form used descriptively or to form verbs--for example, "the locked door," "The door has been locked."

WordReference Random House Learner's Dictionary of American English © 2020
in•val•i•date /ɪnˈvælɪˌdeɪt/USA pronunciation   v. [+ object], -dat•ed, -dat•ing. 
  1. to discredit; show that (something) is incorrect:This new finding invalidates his previous argument.
  2. to deprive of legal force;
    nullify:The judge invalidated the guilty verdict and set the defendant free.
in•val•i•da•tion /ɪnˌvælɪˈdeɪʃən/USA pronunciation  n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2020
in•val•i•date  (in vali dāt′),USA pronunciation v.t.,  -dat•ed, -dat•ing. 
  1. to render invalid;
  2. to deprive of legal force or efficacy;
in•val′i•dation, n. 
in•vali•da′tor, n. 
  • invalid2 + -ate1 1640–50
    • 1.See corresponding entry in Unabridged weaken, impair;
      disprove, refute, rebut.

Collins Concise English Dictionary © HarperCollins Publishers::
invalidate /ɪnˈvælɪˌdeɪt/ vb (transitive)
  1. to render weak or ineffective, as an argument
  2. to take away the legal force or effectiveness of; annul, as a contract

inˌvaliˈdation n inˈvaliˌdator n
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