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negate

ne·gate [ nə gáyt ] (past and past participle ne·gat·ed, present participle ne·gat·ing, 3rd person present singular ne·gates)


transitive verb 
Definition:
 
1. invalidate something: to declare officially that something is invalid or ineffective, or make something invalid or ineffective ( formal )
Failure to disclose such a change of circumstances would automatically negate the policy.
a theory that negates all previous research

2. logic prove something is false: to deny the truth of something, or prove something to be false

[Early 17th century. < Latin negat-, past participle of negare "deny"]

ne·ga·tor noun

Word Key: Synonyms

See nullify.

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