Pronunciation: ( —adv.ō'vur-nīt'; —adj., n.ō'vur-nīt"; —v.ō"vur-nīt'),[key] —adv. 1. for or during the night: to stay overnight. 2. on or during the previous evening: Preparations were made overnight. 3. very quickly; suddenly: New suburbs sprang up overnight.
—adj. 1. done, made, occurring, or continuing during the night: an overnight stop; an overnight decision. 2. staying for one night: a group of overnight guests. 3. designed to be used on a trip or for a journey lasting one night or only a few nights.
4. intended for delivery on the next day: overnight letters; an overnight package. 5. valid for one night: The corporal got an overnight pass. 6. occurring suddenly or within a very short time: a comedian who became an overnight sensation.
—n. 1. Informal.an overnight stay or trip: Our daughter had an overnight at a friend's house. 2. Informal.a permit for overnight absence, as from a college dormitory: She had an overnight the night of the prom. 3. the previous evening.
—v.i. to have an overnight stay or trip: We'll overnight in Denver, then fly on to San Diego.