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domain

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noun [countable] American English pronunciation: domain /doʊˈmeɪn/ 
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singulardomain
pluraldomains
  1. 1
    a particular area of activity or life

    This is a subject that has now moved into the political domain.

    1. a.
      an area of activity considered as belonging to or controlled by a particular person or group

      the common idea that engineering is a male domain

      Organic foods are no longer the sole domain of health fanatics.

      The garden has always been Al's domain.

    See also  public domain

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major on (doing) sth

to have or do a lot of something; to focus on a particular thing

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