‖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.” A. W. Ward.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.