/ Dictionary / Index I interquartile range: Meaning and Definition of Find definitions for: in•ter•quar'tile range" Pronunciation: (in"tur-kwôr'tīl, -til), [key] — Statistics. Statistics. the range of values of a frequency distribution between the first and third quartiles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. interpupillary interracial Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language