/ Dictionary / Index T twenty-third: Meaning and Definition of Find definitions for: twen•ty-third Pronunciation: (twen'tē-thûrd', twun'-), [key] — adj. next after the twenty-second; being the ordinal number for 23. being one of 23 equal parts. —n. a twenty-third part, esp. of one (). the twenty-third member of a series. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: twenty-third (Thesaurus) Twenty-sixth Amendment Twenty-third Amendment Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language