WordReference Random House Learner's Dictionary of American English © 2015
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]
  • done, made, occurring, or continuing during the night:an overnight flight.
  • staying for one night:overnight guests.
  • being or intended for delivery on the next day:overnight mail.
  • occurring suddenly or within a very short time:an overnight success.

  • n. [countable]
  • History, Informal Termsan 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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