Decennium n. : A period of ten years.

Example:


Taxonomy
decennium, Wiktionary, Dutch, Swedish, Etymology, Galileo's telescope, free dictionary, search, Synonyms, Translations, Pronunciation, quotations, cope, heritage, Conservative, reigns, act together, Ronnie.

Defination from the web:
decennium. Plural. decenniums or decennia. decennium (plural decenniums or decennia) a period of ten years. quotations: ... 20 years of consecutive Conservative reigns, just as you guys are getting your act together after almost a decennium of Enlightened Ronnie. ...