Decorum(n.) 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.
Thesaurus Entries
amenities, appropriateness, becomingness, bienseance, ceremoniousness, civilities, civility, comity, conformity, convenance, convention, conventional usage, conventionalism, conventionality, correctitude, correctness, courtliness, custom, decencies, decency, decorousness, delicacy, deportment, dignity, diplomatic code, elegance, elegancies, etiquette, exquisite manners, felicity, fitness, fittingness, form, formalities, formality, genteelness, gentility, good form, good manners, goodness, happiness, mannerliness, manners, meetness, modesty, mores, natural politeness, niceness, normality, normativeness, order, orderliness, point of etiquette, politeness, politesse, properness, proprieties, propriety, protocol, pudency, pudicity, punctilio, quiet good manners, respectability, righteousness, rightness, rules of conduct, seemliness, shame, social code, social conduct, social convention, social graces, social procedures, social usage, solemnity, suitability, urbanity, usage