1 [countable usually plural]
something pretty that you put onto something else in order to make it more attractive:
the style in which something is decorated:
He is an expert on Islamic decoration.
a box with paper flowers glued to it for decoration
3 [uncountable] British English
when you paint or put special paper on the inside walls, ceiling etc of a house or building
something such as a medal that is given to someone as an official sign of honour