/ Dictionary / Index O overnighter: Meaning and Definition of Find definitions for: o•ver•night•er Pronunciation: (ō"vur-nī'tur), [key] — n. an overnight stay or trip. a traveler or visitor making an overnight stay. something serving overnight travel, as a special train or an overnight bag. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: overnighter (Thesaurus) overnight bag overnight telegram Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language