(n.) The act of annulling.

abolishment abrogation annihilation annulment cancel canceling cancellation cassation choking choking off countermand counterorder defeasance deracination destruction elimination end eradication extermination extinction extinguishment extirpation invalidation liquidation negation nullification purge recall recantation renege repeal repudiation rescinding rescindment rescission retraction reversal revocation revoke revokement rooting out setting aside silencing snuffing out stifling strangulation suffocation suppression suspension termination uprooting vacation vacatur voidance voiding waiver waiving withdrawal write-off