/ Dictionary / Index T thirty-one: Meaning and Definition of Find definitions for: thir•ty-one Pronunciation: (thûr'tē-wun'), [key] — n. a cardinal number, 30 plus 1. a symbol for this number, as 31 or XXXI. a set of this many persons or things. —adj. amounting to 31 in number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thirty-one (Thesaurus) thirty-ninth thirty-second Related Content Daily Word Quiz: bungled Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language