The Collaborative International Dictionary of English v.0.48:

Beauty \Beau"ty\ (b[=u]"t[y^]), n.; pl. Beauties
   (b[=u]"t[i^]z). [OE. beaute, beute, OF. beaut['e], biaut['e],
   Pr. beltat, F. beaut['e], fr. an assumed LL. bellitas, from
   L. bellus pretty. See Beau.]
   [1913 Webster]
   1. An assemblage of graces or properties pleasing to the eye,
      the ear, the intellect, the [ae]sthetic faculty, or the
      moral sense.
      [1913 Webster]

            Beauty consists of a certain composition of color
            and figure, causing delight in the beholder.
                                                  --Locke.
      [1913 Webster]

            The production of beauty by a multiplicity of
            symmetrical parts uniting in a consistent whole.
                                                  --Wordsworth.
      [1913 Webster]

            The old definition of beauty, in the Roman school,
            was, "multitude in unity;" and there is no doubt
            that such is the principle of beauty. --Coleridge.
      [1913 Webster]

   2. A particular grace, feature, ornament, or excellence;
      anything beautiful; as, the beauties of nature.
      [1913 Webster]

   3. A beautiful person, esp. a beautiful woman.
      [1913 Webster]

            All the admired beauties of Verona.   --Shak.
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   4. Prevailing style or taste; rage; fashion. [Obs.]
      [1913 Webster]

            She stained her hair yellow, which was then the
            beauty.                               --Jer. Taylor.
      [1913 Webster]

   Beauty spot, a patch or spot placed on the face with intent
      to heighten beauty by contrast.
      [1913 Webster]

WordNet (r) 3.0 (2006):

beauty
    n 1: the qualities that give pleasure to the senses [ant:
         ugliness]
    2: a very attractive or seductive looking woman [syn: smasher,
       stunner, knockout, beauty, ravisher, sweetheart,
       peach, lulu, looker, mantrap, dish]
    3: an outstanding example of its kind; "his roses were
       beauties"; "when I make a mistake it's a beaut" [syn:
       beauty, beaut]

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "beauty":
   Miss America, advantage, asset, attraction, attractiveness,
   balance, bathing beauty, beau ideal, beaut, beauty contest winner,
   beauty queen, belle, bunny, charmer, concinnity, cover girl,
   dazzler, dream, dreamboat, enchantress, equilibrium, euphony,
   eye-opener, eyeful, good-looker, great beauty, handsomeness,
   harmony, knockout, lady fair, looker, loveliness, lovely, measure,
   measuredness, model, order, orderedness, paragon, peach, pinup,
   pinup girl, proportion, pulchritude, pussycat, raving beauty,
   reigning beauty, rhythm, sex kitten, slick chick, strength,
   stunner, sweetness, symmetry, toast



The Devil's Dictionary (1881-1906):

BEAUTY, n.  The power by which a woman charms a lover and terrifies a
husband.