/ ɪnˈvælɪdeɪt; NAmE / verb [ vn ]
1.
to prove that an idea, a story, an argument, etc. is wrong :
This new piece of evidence invalidates his version of events.
2.
if you invalidate a document, contract, election, etc., you make it no longer legally or officially valid or acceptable
OPP validate
► in·vali·da·tion / ɪnˌvælɪˈdeɪʃn; NAmE / noun [ U ]
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WORD ORIGIN
mid 17th cent.: from medieval Latin invalidat- annulled, from the verb invalidare (based on Latin validus strong).