/ Dictionary / Index T tonight: Meaning and Definition of Find definitions for: to•night Pronunciation: (tu-nīt'), [key] — n. this present or coming night; the night of this present day. —adv. on this present night; on the night of this present day. during last night. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tonight (Thesaurus) tonic water tonk 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