/ Dictionary / Index O overnight bag: Meaning and Definition of Find definitions for: overnight' bag" Pronunciation: [key] a travel bag large enough to hold personal articles and clothing for an overnight trip. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. overnight overnighter Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language