Tuxedo/tʌkˈsiːdəʊ/ Definition 1 of 3Pro Tip 1/3Black Tie Events Tuxedos are typically required for 'black tie' events which are very formal. The invitation said 'black tie', so I rented a tuxedo. Pro Tip 2/3Wedding Attire Tuxedos are often worn by grooms and groomsmen in weddings. The groomsmen were all in matching tuxedos. Pro Tip 3/3Prom Nights High school students sometimes wear tuxedos to their prom. He's trying on tuxedos for his senior prom.