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DictionarydecorumProper behavior
noun

decorum

dih-KOR-um/dɪˈkɔːrəm/

Proper, dignified behavior suited to a situation.

The mourners show decorum by standing quietly with respectful, composed postures.

At a funeral, two formally dressed mourners stand quietly beside a flower-topped coffin.
Etymology
decorumLatinwhat is fitting

Latin decorum named “what is fitting.” Applied first to literary or artistic composition in English, it came to describe the same appropriateness in speech, dress, and behavior.

In context

TED3:08
modern usage equates civility with decorum, with formal politeness, formal behavior. We've gotten away from the idea of citizenship.
3 ways to practice civility | Steven Petrow

More examples

  • Even when they disagree, committee members speak with decorum.
  • Shouting across the table shows a lack of decorum.
  • Guests observe the decorum expected at a formal ceremony.

Forms

decorous adjective — Proper and dignified in behavior or appearance.

Similar words

propriety
Emphasizes conformity to accepted standards rather than dignified conduct.
etiquette
Refers to specific social rules rather than behavior itself.