LATIN DICTIONARYLexicon Latīnum
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“propriety” in Latin

The English word propriety itself goes back to Latin proprius, through proprietās.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

propriety
Peculiarity of possession, [Vid: “Right of PROPERTY”].
Suitableness, fitness, convenientia (fitness): congruentia (especially in outward conduct): decorum (in all one’s behavior and demeanor): honestas (in a moral sense): venustas or dignitas ac venustas (e.g., to act cum dignitate ac venustate).

Quick answer

What is the Latin word for propriety?
The usual Latin words for “propriety” are conveniō, congruō, decus; also honestus, venustus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.