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Adjective: overnight  'owvur'nIt
  1. Lasting, open, or operating through the whole night
    "an overnight trip"
    - nightlong, all-night
Adverb: overnight  'owvur'nIt
  1. During or for the length of one night
    "the fish marinates overnight"
     
  2. Happening in a short time or with great speed
    "these solutions cannot be found overnight!"

See also: long

Encyclopedia: Overnight