black-tie

See also: black tie

English

Moderately formal; usually requiring a dinner jacket (tuxedo) for men.
- 2020 August 26, “Registrations reach 250 for virtual National Rail Awards 2020”, in Rail, page 23:
  The event was originally planned to take place as a black-tie dinner and awards ceremony at the Grosvenor House Hotel in London's Park Lane, as in previous years.