WordReference Random House Learner's Dictionary of American English © 2014
o•ver•night /adv. ˈoʊvɚˈnaɪt; adj., n. ˈoʊvɚˌnaɪt/USA pronunciation  adv. 
  1. for or during the night:We'll stay overnight and leave early tomorrow morning.
  2. very quickly; suddenly:New suburbs sprang up overnight.
  3. on the previous evening:Preparations were made overnight.

adj. [before a noun]
  1. done, made, occurring, or continuing during the night:an overnight flight.
  2. staying for one night:overnight guests.
  3. being or intended for delivery on the next day:overnight mail.
  4. occurring suddenly or within a very short time:an overnight success.

n. [countable]
  1. an overnight stay or trip.

Collins Concise English Dictionary © HarperCollins Publishers::

overnight adv /ˌəʊvəˈnaɪt/
  1. for the duration of the night
  2. in or as if in the course of one night; suddenly: the situation changed overnight
adj /ˈəʊvəˌnaɪt/(usually prenominal)
  1. done in, occurring in, or lasting the night: an overnight stop
  2. staying for one night
  3. for use during a single night
  4. occurring in or as if in the course of one night; sudden: an overnight victory

'overnight' also found in these entries:

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