semi-formal

Thesaurus

Adj.

1.

semi-formal - moderately formal; requiring a dinner jacket; "he wore semiformal attire"; "a black-tie dinner"black-tie, semiformalformal - being in accord with established forms and conventions and requirements (as e.g. of formal dress); "pay one's formal respects"; "formal dress"; "a formal ball"; "the requirement was only formal and often ignored"; "a formal education"