Breadcrumb Home > Dictionary > Index T triennium: Meaning and Definition of Find definitions for: tri•en•ni•um Pronunciation: (trī-en'ē-um), [key] — pl. -en•ni•ums, -en•ni•a a period of three years. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. triennial triens 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: turgid Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language