[beau.ty] n, pl beauties [ME beaute, fr. OF biaute, fr. bel, biau beautiful, fr. L bellus pretty; akin to L bonus good--more at bounty] (14c) 1: the quality or aggregate of qualities in a person or thing that gives pleasure to the senses or pleasurably exalts the mind or spirit: loveliness
2: a beautiful person or thing; esp: a beautiful woman
3: a particularly graceful, ornamental, or excellent quality
4: a brilliant, extreme, or egregious example or instance "that mistake was a ~"
5: a quantum characteristic that accounts for the existence and lifetime of the upsilon particle; also: a particle having this characteristic