Definition of propriety noun from the Oxford Advanced Learner's Dictionary

     

    propriety

     noun
    noun
    BrE BrE//prəˈpraɪəti//
     
    ; NAmE NAmE//prəˈpraɪəti//
     
    (formal) Moral
     
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  1. 1[uncountable] moral and social behaviour that is considered to be correct and acceptable Nobody questioned the propriety of her being there alone. opposite impropriety See related entries: Moral
  2. 2the proprieties [plural] the rules of correct behaviour synonym etiquette They were careful to observe the proprieties. The company had acted in accordance with all legal proprieties.
  3. Word Origin late Middle English (in the sense ‘peculiarity, essential quality’): from Old French propriete, from Latin proprietas, from proprius ‘one's own, particular’.
See the Oxford Advanced American Dictionary entry: propriety