Breadcrumb Home > Dictionary > Index I index number: Meaning and Definition of Find definitions for: in'dex num"ber Pronunciation: [key] — Statistics. Statistics. a quantity whose variation over a period of time measures the change in some phenomenon. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. index-link index of leading indicators 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: raconteur Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language