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

open

noun
 
/ˈəʊpən/
 
/ˈəʊpən/
the open
[singular]
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    outdoors

  1. outdoors; the countryside
    • in the open Children need to play out in the open.
  2. not hidden

  3. in/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 OriginOld English open (adjective), openian (verb), of Germanic origin; related to Dutch open and German offen, from the root of the adverb up.
See open in the Oxford Advanced American Dictionary
aspiration
noun
 
 
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