dec·o·rate / ˈdekəˌrāt/ • v. [tr.] 1. make (something) look more attractive by adding ornament to it. ∎  provide (a room or building) with a color scheme, paint, wallpaper, etc..2. confer an award or medal on (a member of the armed forces).

decorate †adorn XVI; deck with ornamental accessories XVIII; invest with an honour XIX. f. decorate pp. (XV) or its source L. decorātus, -āre beautify, f. decus, decor-; see DECOROUS and -ATE 3.
So decoration XV. — (O)F. or late L. decorative XV. — F. decorous f. L. decōrus, rel. to decēns DECENT. decorum XVI. — L.