1. formal evening dress for men (distinguished from black tie).
2. a white bow tie for men, worn with formal evening dress.
Pronunciation: (hwīt'tī', wīt'-), [key]
requiring that guests wear formal attire, esp. that men wear white bow ties with formal evening dress: a white-tie embassy reception. Cf. black-tie.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.