(n.) The act of obliterating, or the state of being obliterated; extinction.

Lethe absentmindedness blot blotting blotting out cancel cancellation decay of memory deletion effacement erasure expunction forgetfulness forgetting forgiveness grace period hazy recollection heedlessness moratorium nepenthe nirvana oblivion obliviousness scrubbing short memory unmindfulness washing out waters of oblivion wiping out write-off