decennium
NounOpen English WordNet
Word of the day · Sep 28About this word
onerousadjective
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Webster's Dictionary (1913)
De·cen′ni·um noun; pl. Decenniums (#), L. Decennia (#).
Origin: L.
A period of ten years. “The present decennium.” Henry Hallam “The last decennium of Chaucer's life.” Adolphus William Ward
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54