decennium

noun

de·​cen·​ni·​um di-ˈse-nē-əm 

plural decenniums or decennia di-ˈse-nē-ə 

: a period of 10 years : decade

Word History

Etymology

Latin, from decem + annus year — more at annual

First Known Use

1685, in the meaning defined above

Rhymes for decennium

• biennium
• millennium
• quinquennium