Definition of alien noun from the Oxford Advanced American Dictionary

     

    alien

     noun
    noun
    NAmE//ˈeɪliən//
     
    , NAmE//ˈeɪlyən//
     
     
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  1. 1(also non-citizen) (law or technology) a person who is not a citizen of the country in which they live or work an illegal alien compare resident alien
  2. 2a creature from another world aliens from outer space
See the Oxford Advanced Learner's Dictionary entry: alien

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