WordWeb Online

1. Moderately formal; requiring a dinner jacket
   "a black-tie dinner";
   - semiformal, semi-formal

1. Semiformal evening dress for men
   - dinner jacket [Brit, Cdn], tux [N. Amer, informal], tuxedo [N. Amer]
    
2. A black bow tie worn with a dinner jacket

Derived forms: black ties

See also: formal

Type of: bow tie, bowtie, bow-tie, evening clothes, evening dress, eveningwear, formalwear

Encyclopedia: Black-tie