means A man's formal evening suit, typically black with satin lapels, worn with a bow tie.

from Named for Tuxedo Park, a wealthy resort enclave north of New York City. The popular story credits a tobacco heir, Griswold Lorillard, who supposedly turned up to an 1880s autumn ball in a shocking tailless dinner jacket; whatever the exact details, the garment took its name from the place where America's elite first made the look fashionable. (The place name itself comes from a word in an Algonquian language — often said to mean something like 'place of the bear' or 'round foot,' though the precise sense is uncertain.)