It’s about time. We are now on Instagram!
early 15c., "action of decorating, beautification," from Late Latin decorationem (nominative decoratio), noun of action from past participle stem of decorare (see decorate). Meaning "that which decorates" is from 1670s. As "a badge or medal worn as a mark of honor," it is attested from 1816 (often in plural, decorations).