/ Dictionary / Index V volatility index: Meaning and Definition of Find definitions for: vol'atil'ity in"dex Pronunciation: [key] — Stock Exchange. Stock Exchange. beta (def. 6). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. volatile oil volatilize Related Content Daily Word Quiz: divulge Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language