overnight /əʊvə(ɹ)ˈnaɪt/adverb 2noun 4adjective 3verb 2forms 3 adverb2 •during the night, until the next morningLet it run overnight and we'll check on it in the morning.They delivered the package overnight. •(figurative) In a very short (but unspecified) amount of time.The change seemed to happen overnight. noun4 •An overnight stay, especially in a hotel or other lodging facility. •[in the plural] Viewership ratings for a television show that are published the morning after it is broadcast, and may be revised later on.Word spread that Barney was on his way out to the location and that the Nielsen overnights had been terrific, or why else would he come. — 2000 •An item delivered or completed overnight.Have you looked at the overnights yet? •(no longer used) The fore part of the previous night; yesterday evening.Pardon me, madam: If I had given you this at overnight, She might have been o'erta'en — 1604 adjective3 •Occurring between dusk and dawn.The overnight ferry docked at 10 a.m. •For which participants stay overnight.They sent their kids to overnight camp.We went on an overnight ski trip. •Complete before the next morning.Don't expect overnight delivery. verb2 •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. — 2002 •(US) To send something for delivery the next day.We can overnight you the documents for signature. formsovernighted · overnighting · overnights