Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of decennium is as below...

Decennium :: Decennium (n.) A period of ten years.

Decade :: Decade (n.) A group or division of ten; esp., a period of ten years; a decennium; as, a decade of years or days; a decade of soldiers; the second decade of Livy..

Decenniums :: Decenniums (pl. ) of Decenniu.

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