Source : Webster's Revised Unabridged Dictionary (1913)

Oblivion \Ob*liv"i*on\, n. [L. oblivio, akin to oblivisci to
   forget: cf. OF. oblivion.]
   1. The act of forgetting, or the state of being forgotten;
      cessation of remembrance; forgetfulness.

            Second childishness and mere oblivion. --Shak.

            Among our crimes oblivion may be set. --Dryden

            The origin of our city will be buried in eternal
            oblivion.                             --W. Irving.

   2. Official ignoring of offenses; amnesty, or general pardon;
      as, an act of oblivion. --Sir J. Davies.

   Syn: See {Forgetfulness}.

Source : WordNet®

oblivion
     n 1: the state of being disregarded or forgotten [syn: {limbo}]
     2: total forgetfulness; "he sought the great oblivion of sleep"
        [syn: {obliviousness}]