Source : Webster's Revised Unabridged Dictionary (1913)

Obliteration \Ob*lit`er*a"tion\, n. [L. obliteratio: cf.F.
   oblit['e]ration.]
   The act of obliterating, or the state of being obliterated;
   extinction. --Sir. M. Hale.

Source : WordNet®

obliteration
     n 1: destruction by annihilating something [syn: {annihilation}]
     2: the complete destruction of every trace of something [syn: {eradication}]