The Open Dictionary

de rigueur

adjective

UK/də rɪˈɡɜːʳ/
US/də rɪˈɡɝː/

Definitions of de rigueur adjective

  1. After verb

    Required or demanded by fashion, custom, or etiquette; essential.

    • At formal dinners, wearing a gown is de rigueur.

    • Adherence to the rules is de rigueur for any member wishing to be accepted into this club.

    • Wearing a suit is still de rigueur in some traditional industries.