Definition of de rigueur adjective from the Oxford Advanced Learner's Dictionary


de rigueur

BrE BrE//ˌdə rɪˈɡɜː(r)//
; NAmE NAmE//ˌdə rɪˈɡɜːr//
[not before noun] (from French)
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considered necessary if you wish to be accepted socially Evening dress is de rigueur at the casino. Word Originmid 19th cent.: French, literally ‘in strictness’.
See the Oxford Advanced American Dictionary entry: de rigueur