American English

Definition of domain noun from the Oxford Advanced American Dictionary

      

    domain

     noun
    noun
    NAmE//doʊˈmeɪn//
     
    , NAmE//dəˈmeɪn//
     
     
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  1. 1an area of knowledge or activity; especially one that someone is responsible for The care of older people is being placed firmly within the domain of the family. Physics used to be very much a male domain. see also public domain
  2. 2lands owned or ruled by a particular person, government, etc., especially in the past The Spice Islands were within the Spanish domains.
  3. 3(computing) a set of Web sites on the Internet which end with the same group of letters, for example.comor.org
  4. 4(mathematics) the range of possible values of a particular variable
See the Oxford Advanced Learner's Dictionary entry: domain