The Collaborative International Dictionary of English v.0.48:

ornament \or"na*ment\, n. [OE. ornement, F. ornement, fr. L.
   ornamentum, fr. ornare to adorn.]
   That which embellishes or adorns; that which adds grace or
   beauty; embellishment; decoration; adornment.
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         The ornament of a meek and quiet spirit. --1 Pet. iii.
                                                  4.
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         Like that long-buried body of the king
         Found lying with his urns and ornaments. --Tennyson.
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The Collaborative International Dictionary of English v.0.48:

ornament \or"na*ment\, v. t. [imp. & p. p. Ornamented; p. pr.
   & vb. n. Ornamenting.]
   To adorn; to deck; to embellish; to beautify; as, to ornament
   a room, or a city.
   [1913 Webster]

   Syn: See Adorn.
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WordNet (r) 3.0 (2006):

ornament
    n 1: something used to beautify [syn: decoration, ornament,
         ornamentation]
    v 1: make more attractive by adding ornament, colour, etc.;
         "Decorate the room for the party"; "beautify yourself for
         the special day" [syn: decorate, adorn, grace,
         ornament, embellish, beautify]
    2: be an ornament to; "stars ornamented the Christmas tree"