Source : Webster's Revised Unabridged Dictionary (1913)

Deface \De*face"\, v. t. [imp. & p. p. {Defaced}; p. pr. & vb.
   n. {Defacing}.] [OE. defacen to disfigure, efface, OF.
   desfacier; L. dis- + facies face. See {Face}, and cf.
   {Efface}.]
   1. To destroy or mar the face or external appearance of; to
      disfigure; to injure, spoil, or mar, by effacing or
      obliterating important features or portions of; as, to
      deface a monument; to deface an edifice; to deface
      writing; to deface a note, deed, or bond; to deface a
      record. ``This high face defaced.'' --Emerson.

            So by false learning is good sense defaced. --Pope.

   2. [Cf. F. d['e]faire.] To destroy; to make null. [Obs.]

            [Profane scoffing] doth . . . deface the reverence
            of religion.                          --Bacon.

            For all his power was utterly defaste [defaced].
                                                  --Spenser.

   Syn: See {Efface}.

Source : WordNet®

deface
     v 1: mar or spoil the appearance of; "scars defaced her cheeks";
          "The vandals disfigured the statue" [syn: {disfigure}, {blemish}]
     2: deface a building facade, for example