negate
//nɪˈɡeɪt//
Verb
negateInfinitive
negatePresent tense
negatedPast tense
negatedPast participle
negatingPresent participle
negatesThird-person singular
1
To nullify or make ineffective; to cancel out the effect or validity of something.
His rude behavior negated all the goodwill he had built up.
2
To deny the existence, truth, or validity of something.
He tried to negate the evidence presented against him.
3
In logic, to make a statement or proposition negative.
To negate the proposition "All birds can fly," we say "Not all birds can fly."