The Collaborative International Dictionary of English v.0.48:

Ornamentation \Or`na*men*ta"tion\, n.
   1. The act or art of ornamenting, or the state of being
      ornamented.
      [1913 Webster]

   2. That which ornaments. --C. Kingsley.
      [1913 Webster]

   3. The ornaments embellishing an object, collectively; as,
      each room of the palace had a strikingly different
      ornamentation.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

ornamentation
    n 1: the state of being ornamented
    2: something used to beautify [syn: decoration, ornament,
       ornamentation]
    3: the act of adding extraneous decorations to something [syn:
       ornamentation, embellishment]