Breadcrumb Home > Dictionary > Index B bimillennium: Meaning and Definition of Find definitions for: bi•mil•len•ni•um Pronunciation: (bī"mi-len'ē-um), [key] — pl. -len•ni•ums, -len•ni•a a period of two thousand years. a two thousandth anniversary. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bimillennium (Thesaurus) bimillenary Bimini Islands TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: subrosa Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language