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The Collaborative International Dictionary of English v.0.48 (gcide)

Tuxedo \Tux*e"do\, Tuxedo coat \Tux*e"do coat`\, n.
1. A kind of black jacket for semiformal evening dress made
without tails, usually of black or dark blue color and
having satin or grosgrain facing on the lapels; -- so
named after a fashionable country club at Tuxedo Park, New
York. [U. S.] --[RHUD]
[Webster 1913 Suppl. PJC]

2. The complete semiformal evening suit, including the tuxedo
jacket, matching trousers, and black bow tie, and usually
including a cummerbund; -- the style of shirt worn with
this suit varies, and the outfit may include a dickey.
--[RHUD]
[PJC]