/ Dictionary / Index C critical value: Meaning and Definition of Find definitions for: crit'ical val'ue Pronunciation: [key] — Statistics. Statistics. the value of the random variable at the boundary between the acceptance region and the rejection region in the testing of a hypothesis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. critical temperature critical volume Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language