Etymology
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de rigueur

1849, French, literally "of strictness," thus "according to obligation of convention." See rigor.

updated on July 22, 2013

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Definitions of de rigueur from WordNet

de rigueur (adj.)
required by etiquette or usage or fashion;
instruction as to when and where a silk hat is de rigueur
From wordnet.princeton.edu, not affiliated with etymonline.