Breadcrumb Home > Dictionary > Index Z zillion: Meaning and Definition of Find definitions for: zil•lion Pronunciation: (zil'yun), [key] — n., pl. adj. -lions, -lion, —n. an extremely large, indeterminate number. —adj. of, pertaining to, or amounting to a zillion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: zillion (Thesaurus) zillah zillionaire 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: parallax Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language