The Collaborative International Dictionary of English v.0.48:

Adornment \A*dorn"ment\ (-ment), n. [Cf. OF. adornement. See
   Adorn.]
   An adorning; an ornament; a decoration.
   [1913 Webster]

WordNet (r) 3.0 (2006):

adornment
    n 1: a decoration of color or interest that is added to relieve
         plainness
    2: the action of decorating yourself with something colorful and
       interesting

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "adornment":
   adjunct, arrangement, beauties, beautification, beauty treatment,
   color, color patterns, colors, colors of rhetoric, decor,
   decoration, elaboration, elegant variation, embellishment,
   emblazonment, emblazonry, embroidery, facial, figure,
   figure of speech, fine writing, floridity, floridness, flourish,
   flower arrangement, floweriness, flowers of speech, frill,
   furniture arrangement, garnish, garnishment, garniture,
   hairdressing, illumination, lushness, luxuriance, manicure,
   ornament, ornamentation, prettification, purple patches, trim,
   trimming, window dressing