Demeanour vs. Decorum — What's the Difference?

Alternative spelling of demeanor

Decorum (from the Latin: "right, proper") was a principle of classical rhetoric, poetry and theatrical theory concerning the fitness or otherwise of a style to a theatrical subject. The concept of decorum is also applied to prescribed limits of appropriate social behavior within set situations.

(behavioral attributes) the way a person behaves toward other people

Appropriateness of behavior or conduct; propriety

Decorums The conventions or requirements of polite behavior

The appropriateness of an element of an artistic or literary work, such as style or tone, to its particular circumstance or to the composition as a whole.

(uncountable) Appropriate social behavior.

(countable) A convention of social behavior.

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.

Propriety in manners and conduct