1. (n.) The act of denying; contradiction; assertion of nonreality or untruthfulness\; declaration that something is not, or has not been, or will not be; denial; -- the opposite of affirmation.

2. (adv.) Description or definition by denial, exclusion, or exception; statement of what a thing is not, or has not, from which may be inferred what it is or has.

abnegation abolishment abolition absence annihilation annulment antagonism argumentation bucking challenge choking choking off clashing conflict contention contradiction contraposition contravention contraversion controversy counteraction counterworking crosscurrent crossing declension declination declinature declining denial deprivation deracination difference disaccord disaccordance disagreement disallowance disclaimer disclamation disconfirmation discord discordance discordancy discrepancy disharmony disobedience disparity disproof disproval disproving dissension dissent dissidence dissonance disunion disunity divergence diversity elimination emptiness eradication explosion expose exposure extermination extinction extinguishment extirpation faction gainsaying head wind holding back impugnation impugnment inaccordance inequality invalidation jarring liquidation nay negative negative answer negativeness negativity nihility nix no nonacceptance nonbeing noncompliance nonconsent nonentity nonexistence nonobservance nonoccurrence nonreality nonsubsistence not-being nothingness nullification nullity opposing opposition opposure oppugnancy oppugnation purge rebutment rebuttal recantation redargution reductio ad absurdum refusal rejection repudiation repugnance resistance retention rooting out silencing snuffing out standing against stifling strangulation suffocation suppression thumbs-down traversal turndown unactuality undercurrent unharmoniousness unreality unwillingness uprooting vacancy vacuity vacuum variance void voiding withholding