Decorum, originating from the Latin decorum ("right, proper"), refers to the suitability of style in relation to subject matter in rhetoric, poetry, and theatre, as well as established social conduct. From Aristotle to Horace, classical theorists highlighted stylistic balance, while Renaissance drama wrestled with onstage appropriateness.
Writers such as Gilbert Keith Chesterton examined the conflict between humor and vulgarity within decorum, Thorstein Veblen connected it to social stratification, and Leo Tolstoy revealed its function in concealing family discord. Modernist authors questioned its limitations, redefining literary and social standards. Thus, decorum continues to serve as a link between aesthetic tradition and shifting norms of behavior.