i Register
In some senses, overnight is marked as figuratively, obsolete, US. Watch for register when choosing this word.
adv
During or throughout the night, especially during the evening or night just past.
Let it run overnight and we'll check on it in the morning.
They delivered the package overnight.
In a very short (but unspecified) amount of time.
The change seemed to happen overnight.
Overnight, the vivacious young actress became a caricature, a relic of the previous decade, whose hard-partying socialite image seemed frivolous and out of touch amid the ensuing years of the Great Depression.
adj
Occurring between dusk and dawn.
The overnight ferry docked at 10 a.m.
Complete before the next morning.
Don't expect overnight delivery.
Federal Express handled 225 million overnight and second-day packages, cornering a 50-percent share of the entire domestic overnight market[…].
For which participants stay overnight.
They sent their kids to overnight camp.
We went on an overnight ski trip.
verb
To stay overnight; to spend the night.
His visits to Paris (which he had not allowed his son to visit until he was a teenager) became less frequent too: he never over-nighted there, for example, after 1744.
To send something for delivery the next day.
We can overnight you the documents for signature.