alien Definition in the Cambridge English Dictionary
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Definition of “alien” - English Dictionary

Definition of "alien" - American English Dictionary

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aliennoun [C]

 us   /ˈeɪ·li·ən/
a ​person who ​lives in a ​country but is not a citizen (= ​member of a ​country with ​specificrights) An alien is also a ​creature from a ​planet other than Earth.

alienadjective

 us   /ˈeɪ·li·ən/
coming from a different ​country, ​race, or ​group; ​foreign: alien ​customs
(Definition of alien from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "alien" - British English Dictionary

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alienadjective

uk   us   /ˈeɪ.li.ən/
coming from a different ​country, ​race, or ​group: an alien ​culture
Synonym
strange and not ​familiar: When I first went to New York, it all ​felt very alien to me. [before noun] relating to ​creatures from another ​planet: an alien ​spacecraft

aliennoun [C]

uk   us   /ˈeɪ.li.ən/
specialized law someone who ​lives in a ​country of which they are not a ​legal citizen : When ​warbroke out the ​governmentrounded up thousands of aliens and put them in ​temporarycamps. a ​creature from a different ​planet
(Definition of alien from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "alien" - Business English Dictionary

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aliennoun [C]

uk   us   /ˈeɪliən/ US LAW
a ​person who ​lives in a ​foreign country of which they are not a citizen: illegal aliens
alien
adjective [before noun]
They are ​recommending that ​long-term alien ​workers should be ​grantedcitizenship.
(Definition of alien from the Cambridge Business English Dictionary © Cambridge University Press)
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