Oxford Dictionary:
a·li·en
/ˈālēən/
adjective
- 1.belonging to a foreign country or nation.
noun
- 1.a foreigner, especially one who is not a naturalized citizen of the country where they are living:"an illegal alien"
Merriam Webster:
alien
adjective
\ ˈā-lē-ən , ˈāl-yən\
Definition of alien
(Entry 1 of 3)
1a: belonging or relating to another person, place, or thing :
STRANGEan alien environment
b: relating, belonging, or owing allegiance to another country or government :
FOREIGN
alien
noun
Definition of
alien (Entry 2 of 3)
1: a person of another family, race, or nationaliens seeking asylum in the U.S.
2: a foreign-born resident who has not been naturalized and is still a subject or citizen of a foreign country
Dictionary.com:
alien
[ eyl-yuhn, ey-lee-uhn ]
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SEE MORE SYNONYMS FOR alien ON THESAURUS.COM
noun
Often Disparaging and Offensive. a resident of one country who was born in or owesallegiance to another country and has not acquired citizenship by naturalization in the countryof residence (distinguished from
citizen). See also
resident alien,
illegal alien.
a foreigner.
a person who has been estranged or excluded.
adjective
residing under a government or in a country other than that of one's birth without having orobtaining the status of citizenship there.