Source : Webster's Revised Unabridged Dictionary (1913)

Efface \Ef*face"\, v. t. [imp. & p. p. {Effaced}; p. pr. & vb.
   n. {Effacing}.] [F. effacer; pref. es- (L. ex) + face face;
   prop., to destroy the face or form. See {Face}, and cf.
   {Deface}.]
   1. To cause to disappear (as anything impresses or inscribed
      upon a surface) by rubbing out, striking out, etc.; to
      erase; to render illegible or indiscernible; as, to efface
      the letters on a monument, or the inscription on a coin.

   2. To destroy, as a mental impression; to wear away.

            Efface from his mind the theories and notions
            vulgarly received.                    --Bacon.

   Syn: To blot out; expunge; erase; obliterate; cancel;
        destroy. -- {Efface}, {Deface}. To deface is to injure
        or impair a figure; to efface is to rub out or destroy,
        so as to render invisible.

Source : WordNet®

efface
     v 1: remove completely from recognition or memory; "efface the
          memory of the time in the camps" [syn: {obliterate}]
     2: make inconspicuous; "efface onself"
     3: remove by or as if by rubbing or erasing; "Please erase the
        formula on the blackboard--it is wrong!" [syn: {erase}, {rub
        out}, {score out}, {wipe off}]