Noun

1. A man with a reputation for fine dress and etiquette; a dandy.
   • 1811, Jane Austen, Sense and Sensibility, chapter 21

     “I do not comprehend the meaning of the word. But this I can say, that if he ever was a beau before he married, he is one still, for there is not the smallest alteration in him.”

     “Oh! dear! one never thinks of married mens’ being beaux—they have something else to do.”

2. A male lover; a boyfriend.
3. A male escort.