Source : Webster's Revised Unabridged Dictionary (1913)

Defacement \De*face"ment\, n.
   1. The act of defacing, or the condition of being defaced;
      injury to the surface or exterior; obliteration.

   2. That which mars or disfigures. --Bacon.

Source : WordNet®

defacement
     n : the act of damaging the appearance or surface of something;
         "the defacement of an Italian mosaic during the Turkish
         invasion"; "he objected to the dam's massive
         disfigurement of the landscape" [syn: {disfigurement}, {disfiguration}]