the world > time > period > year > [noun] > period of specific number of years > decade (14)
spec. Short for ‘decade of years’; a period of ten years.
A space of ten years, a decade (of years).
A period of ten years; a decennium.
A term applied to a number or amount of ten; spec. A period of ten years.
A decennial anniversary or its celebration. U.S.