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ne‧ga‧tion

1 [singular, uncountable] when something is made to have no effect or be the opposite of what it should be :
Much of what passes for Christianity is a negation of Christ's teachings.
Much of what passes for Christianity is a negation of Christ's teachings.2 [uncountable] when someone says no or disagrees :
He shook his head in silent negation.
He shook his head in silent negation.