/ Dictionary / Index T twi-nighter: Meaning and Definition of Find definitions for: twi-night•er Pronunciation: (twī'nī'tur), [key] — n. Baseball. a twi-night doubleheader. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. twi-night Twining Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language