de·cen·ni·um /-niəm/
De·cen·ni·um n.; pl. Decenniums L. Decennia A period of ten years. “The present decennium.” --Hallam. “The last decennium of Chaucer's life.”
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decennium
n : a period of 10 years [syn: decade, decennary]
[also: decennia (pl)]