noun

decorum

decorum, propriety, etiquette

He behaved with the utmost decorum.

He behaved with the utmost decorum.

There is a certain decorum you must follow here.

There is a certain decorum you must follow here.

((with decorum)) in a way that is controlled, calm, and polite He behaved with decorum.

Synonyms: propriety, etiquette, decency; Antonyms: impropriety, indecency

From Latin 'decorus' meaning 'becoming, fitting, proper', related to 'decus' (ornament, honor).

Think of the word 'decorate'. Decorum is about 'decorating' your behavior to be appropriate for a situation.

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