/ Dictionary / Index A acceptance region: Meaning and Definition of Find definitions for: accept'ance re"gion Pronunciation: [key] the set of values of a test statistic for which the null hypothesis is accepted. Cf. rejection region. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acceptance race acceptancy Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language