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



    BrE BrE//ˈeɪliən//
    ; NAmE NAmE//ˈeɪliən//
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  1. 1(North American English also non-citizen) (law or specialist) a person who is not a citizen of the country in which they live or work an illegal alien compare resident alien See related entries: Immigration
  2. 2a creature from another world aliens from outer space
  3. Word OriginMiddle English: via Old French from Latin alienus ‘belonging to another’, from alius ‘other’.Extra examples Do you genuinely believe that space aliens have landed on our planet? During the war, he was imprisoned as an enemy alien. Few movies represent intelligent aliens as physically different from humans. He was convinced that he’d been abducted by aliens. Illegal aliens are usually deported to their country of origin. In the movie aliens invade Earth. It is illegal for employers to hire aliens not authorized for employment. The provisions would broaden the government’s ability to deport aliens.
See the Oxford Advanced American Dictionary entry: alien

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