The definition of a tuxedo is formal attire for men including a dinner jacket and matching pants.(noun)
The outfit that a man wears to a black tie wedding when he gets married is an example of a tuxedo.
See tuxedo in Webster's New World College Dictionary
noun pl. tuxedos
Origin: after the name of a country club at Tuxedo Park, near Tuxedo Lake, N.Y.
See tuxedo in American Heritage Dictionary 4
noun pl. tux·e·dos or tux·e·does
Origin: Short for Tuxedo coat
Origin: , after a country club at Tuxedo Park, a village of southeast New York.
Learn more about tuxedo