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)