Etymology
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black-tie (n.)

as an article of male attire, 1848, from black (adj.) + tie (n.). As an adjective, indicating the style of formal attire that features it, or situations where such is the proper dress, by 1933.

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Definitions of black-tie

black-tie (adj.)
moderately formal; requiring a dinner jacket;
a black-tie dinner
Synonyms: semiformal / semi-formal
From wordnet.princeton.edu