o·ver·night 
(ōvər-nīt′)
(ōvər-nīt′)adj.
1. Lasting for, extending over, or remaining during a night: an overnight trip; an overnight guest.
2. For use over a single night or for a short journey: overnight supplies.
3. Mailed for guaranteed delivery on the next day: an overnight package.
4. Happening as if in a single night; sudden: an overnight success.
adv. (ō′vər-nīt)
1. During or for the length of the night: Let the meat marinate overnight.
2. In or as if in the course of one night; suddenly: became a sensation overnight.
n.
An overnight stay or trip.
v. (ō′vər-nīt) o·ver·night·ed, o·ver·night·ing, o·ver·nights
v.intr.
To spend the night: overnighting at a country inn.
v.tr.
To send by mail or other courier for delivery the next day.