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Longman Dictionary of Contemporary English
black-tie
adjective
COLLOCATIONS FROM OTHER ENTRIES
a black-tie dinner (=where people wear special formal clothes)
▪ He was invited to a black-tie dinner at one of the Oxford colleges.
EXAMPLES FROM OTHER ENTRIES
▪ a black-tie dinner
EXAMPLES FROM CORPUS
▪ A tent worthy of Barnum & Bailey contained an assortment of black-tie outfits worthy of Fortune magazine.
▪ About 1, 500 people at the black-tie affair greeted Clinton with an ovation as he approached the podium.
▪ Evening meals were black-tie affairs attended by selected officers.
▪ Marshall set only one condition on his gift: No black-tie dinners in his honor.
▪ So the entire black-tie party for 1, 500&.
▪ The Democratic mayor has thrown block parties for the masses and black-tie affairs for the elite.
The Collaborative International Dictionary
black-tie

black-tie \black-tie\ adj. requiring semiformal evening clothes, e. g. a black bowtie and a tuxedo or dinner jacket for men, and a formal dress for women; contrasted with white-tie, for a fully formal occasion, and with informal, and casual. a black-tie dinner

Syn: semi-formal, semiformal.

Wiktionary
black-tie

a. Moderately formal; usually requiring a dinner jacket (tuxedo) for men.

WordNet
black-tie

adj. moderately formal; requiring a dinner jacket; "he wore semiformal attire"; "a black-tie dinner" [syn: semiformal, semi-formal]

Usage examples of "black-tie".

The family usually wore black-tie for holiday meals, but no one could quite envision stumbling out to the biffy in satin pumps, so orders had gone out not to bring formal clothes.

You may think of the theater as being sophisticated and artsy, but our roots are in traveling troupes that were closer to carnivals and snake-oil shows than any black-tie opening night.

After a high-profile black-tie affair in the ballroom of a Washington hotel, the Soviet ambassador had discovered a picture postcard in his coat pocket as his limousine returned him to the embassy.

Harper Stokes's confession of healthcare fraud that he would casually drop at his daughter's black-tie event, high on vodka tonics and friends.