Propriety of manner or conduct; grace arising from suitableness of speech and behavior to one's own character, or to the place and occasion; decency of conduct; seemliness; that which is seemly or suitable
(Lt "propriety") The use of language and form appropriate to the occasion This is a cardinal principle of ancient rhetoric, beginning in the Mediterranean area with Aristotle and continuing through Quintilian
Decorum is behaviour that people consider to be correct, polite, and respectable. I was treated with decorum and respect throughout the investigation. = politeness. behaviour that shows respect and is correct for a particular situation, especially a formal occasion (decorus; DECOROUS)
literary and dramatic appropriateness; orderliness; appropriateness in good taste in conduct or appearance