/ Dictionary / Index M mean value: Meaning and Definition of Find definitions for: mean' val'ue Pronunciation: [key] the ratio of the integral of a given function over a closed interval to the length of the interval. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. meantone system mean value theorem Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language