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negate (v.)

"deny, make negative or null," 1795 (with an isolated use from 1620s), a back-formation from negation, or else from Latin negatus, past participle of negare, from PIE root *ne- "not." Related: Negated; negates; negating.

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Definitions of negate from WordNet

negate (v.)
be in contradiction with;
Synonyms: contradict / belie
negate (v.)
deny the truth of;
Synonyms: contradict / contravene
negate (v.)
prove negative; show to be false;
Synonyms: contradict
negate (v.)
make ineffective by counterbalancing the effect of;
This action will negate the effect of my efforts
From wordnet.princeton.edu