1. To add something to in order to make it more attractive; to adorn; to ornament.
2. To plan and arrange colors, furnishings, etc. of a room or building: The Mark family hired a professional worker to paint and to wallpaper their house.
3. To give a medal or similar token of honor to someone.
5. Etymology: decorate comes from Latin decoratus, the past participle of decorare, "to make beautiful", a verb derived from decus, "ornament".

Its root decor-, also produced the adjective decorus, "beautiful, seemly", from which English gets decorous and via its neuter singular form, decorum.

Décor is a 19th-century borrowing from French, where it was a derivative of the verb décorer.