Pronunciation: (tuk-sē'dō), [key]
1. Also called dinner jacket. a man's jacket for semiformal evening dress, traditionally of black or dark-blue color and characteristically having satin or grosgrain facing on the lapels.
2. the complete semiformal outfit, including this jacket, dark trousers, often with silk stripes down the sides, a bow tie, and usually a cummerbund.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.