Definition of open noun from the Oxford Advanced Learner's Dictionary

     

    open

     noun
    noun
    BrE BrE//ˈəʊpən//
     
    ; NAmE NAmE//ˈoʊpən//
     
    the open[singular]
     
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    outdoors
  1. 1outdoors; the countryside Children need to play out in the open.
  2. not hidden
  3. 2in/into the open not hidden or secret Government officials do not want these comments in the open. They intend to bring their complaints out into the open.
  4. Word Origin Old English open (adjective), openian (verb), of Germanic origin; related to Dutch open and German offen, from the root of the adverb up.
See the Oxford Advanced American Dictionary entry: open