Etymology
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propriety (n.)

early 15c., "fitness, proper character," from Old French proprieté "individuality, peculiarity; property," a later form of the vernacular proprete (which became English property), from Latin proprietatem (nominative proprietas) "appropriateness," also "ownership" (see property). The meaning "appropriateness, suitableness to an acknowledged or correct standard or rule" is attested from 1610s; the sense of "conformity to good manners" is from 1782.

updated on December 16, 2020

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Definitions of propriety from WordNet

propriety (n.)
correct or appropriate behavior;
Synonyms: properness / correctitude
From wordnet.princeton.edu, not affiliated with etymonline.