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de rigueur

[duh ri-gur; French duh ree-gœr] /də rɪˈgɜr; French də riˈgœr/
noun
1.
strictly required, as by etiquette, usage, or fashion.
Origin
1825-1835
1825-35; < French
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for de rigueur

de rigueur

/də riɡœr; English də rɪˈɡɜː/
adjective
1.
required by etiquette or fashion
Word Origin
literally: of strictness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for de rigueur

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

Online Etymology Dictionary, © 2010 Douglas Harper
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de rigueur in Culture
de rigueur [(duh ree-gur)]

A French term meaning necessary according to convention: “Formal dress is de rigueur at weddings.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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