You can stay overnight if you want to. Don't forget to pack an overnight bag (= a bag for things that you need when you stay away from home for a night).
FedEx overnight services provide overnight shipping for fast delivery to ZIP codes in the U.S. and around the globe to ensure your package arrives the next day.
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.
Let’s start by clearing up any confusion: overnight is the correct spelling so long as you mean to describe something that took place “all through the night.” In most cases, over night (two words) would be incorrect and possibly considered a typo.
If something happens overnight, it happens throughout the night or at some point during the night. The weather remained calm overnight. The decision was reached overnight. Overnight is also an adjective.
for or during the night: We'll stay overnight and leave early tomorrow morning. suddenly: New suburbs sprang up overnight. on the previous evening: Preparations were made overnight. done, made, occurring, or continuing during the night: an overnight flight. staying for one night: overnight guests.
When something happens overnight, it occurs during the hours of one night. An overnight party can also be called a sleepover or a slumber party. (Pack your sleeping bag, but you probably won't use it.)
overnight (third-person singular simple present overnights, present participle overnighting, simple past and past participle overnighted) (intransitive) To stay overnight; to spend the night. [from 19th c.]
Overnight can be an adjective or an adverb. Either way, it refers to something that happens in the span of time between one day and the next day.