the qualities in a person or thing a quality that gives pleasure to the senses or exalt satisfies the aesthetic demands of the mind or spirit; loveliness
Beauty is truth, truth beauty — Keats
a beautiful person or thing; esp a beautiful woman
a brilliant, or extreme, or conspicuous example of something or instance
That mistake was a beauty
a particularly advantageous or excellent quality
The beauty of my idea is that it costs so little
[Middle English beaute from Old French biauté, from bel, biau beautiful, from Latin bellus pretty]