Source : Webster's Revised Unabridged Dictionary (1913)

Obliterate \Ob*lit"er*ate\, v. t. [imp. & p. p. {Obliterated};
   p. pr. & vb. n. {Obliterating}.] [L. obliteratus, p. p. of
   obliterare to obliterate; ob (see {Ob-}) + litera, littera,
   letter. See {Letter}.]
   1. To erase or blot out; to efface; to render undecipherable,
      as a writing.

   2. To wear out; to remove or destroy utterly by any means; to
      render imperceptible; as. to obliterate ideas; to
      obliterate the monuments of antiquity.

            The harsh and bitter feelings of this or that
            experience are slowly obliterated.    --W. Black.

Obliterate \Ob*lit"er*ate\, a. (Zo["o]l.)
   Scarcely distinct; -- applied to the markings of insects.

Source : WordNet®

obliterate
     adj : reduced to nothingness [syn: {blotted out}, {obliterated}]

obliterate
     v 1: mark for deletion, rub off, or erase; "kill these lines in
          the President's speech" [syn: {kill}, {wipe out}]
     2: make undecipherable or imperceptible by obscuring or
        concealing; "a hidden message"; "a veiled threat" [syn: {obscure},
         {blot out}, {veil}, {hide}]
     3: remove completely from recognition or memory; "efface the
        memory of the time in the camps" [syn: {efface}]
     4: do away with completely, without leaving a trace