Breadcrumb Home > Dictionary > Index S standard deviation: Meaning and Definition of Find definitions for: stand'ard devia'tion Pronunciation: [key] — Statistics. Statistics. a measure of dispersion in a frequency distribution, equal to the square root of the mean of the squares of the deviations from the arithmetic mean of the distribution. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. standard cost standard dollar 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: persiflage Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language