Source : Webster's Revised Unabridged Dictionary (1913)

Matt \Matt\, n.
   See {Matte}. --Knight.

Source : WordNet®

matt
     adj : not reflecting light; not glossy; "flat wall paint"; "a
           photograph with a matte finish" [syn: {flat}, {mat}, {matte},
            {matted}]

matt
     n : the property of having little or no contrast; lacking
         highlights or gloss [syn: {flatness}, {lusterlessness}, {lustrelessness},
          {mat}, {matte}]