alien Meaning in the Cambridge English Dictionary Cambridge dictionaries logo
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Meaning of “alien” in the English Dictionary

"alien" in British English

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alienadjective

uk   /ˈeɪ.li.ən/ us   /ˈeɪ.li.ən/

aliennoun [C]

uk   /ˈeɪ.li.ən/ us   /ˈeɪ.li.ən/
(Definition of alien from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"alien" in American English

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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 specific rights)
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)

"alien" in Business English

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aliennoun [C]

uk   /ˈeɪliən/ us   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 granted citizenship.
(Definition of alien from the Cambridge Business English Dictionary © Cambridge University Press)
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“alien” in British English

“alien” in American English

“alien” in Business English

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