Breadcrumb Home > Dictionary > Index D decennium: Meaning and Definition of Find definitions for: de•cen•ni•um Pronunciation: (di-sen'ē-um), [key] — pl. -cen•ni•ums, -cen•ni•a a period of ten years; a decade. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: decennium (Thesaurus) decennial decent TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: quisling Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language