Source : Webster's Revised Unabridged Dictionary (1913)

Decoration \Dec`o*ra"tion\, n. [LL. decoratio: cf. F.
   d['e]coration.]
   1. The act of adorning, embellishing, or honoring;
      ornamentation.

   2. That which adorns, enriches, or beautifies; something
      added by way of embellishment; ornament.

            The hall was celebrated for . . . the richness of
            its decoration.                       --Motley.

   3. Specifically, any mark of honor to be worn upon the
      person, as a medal, cross, or ribbon of an order of
      knighthood, bestowed for services in war, great
      achievements in literature, art, etc.

   {Decoration Day}, a day, May 30, appointed for decorating
      with flowers the graves of the Union soldiers and sailors,
      who fell in the Civil War in the United States; Memorial
      Day. [U.S.]

Source : WordNet®

decoration
     n 1: something used to beautify [syn: {ornament}, {ornamentation}]
     2: an award for winning a championship or commemorating some
        other event [syn: {laurel wreath}, {medal}, {medallion}, {palm},
         {ribbon}]
     3: the act of decorating something (in the hope of making it
        more attractive)