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alien (adj.)

c. 1300, "strange, foreign," from Old French alien "strange, foreign;" as a noun, "an alien, stranger, foreigner," from Latin alienus "of or belonging to another, not one's own, foreign, strange," also, as a noun, "a stranger, foreigner," adjective from alius (adv.) "another, other, different," from PIE root *al- (1) "beyond."

Meaning "residing in a country not of one's birth" is from mid-15c. Sense of "wholly different in nature" is from 1670s. Meaning "not of this Earth" first recorded 1920. An alien priory (c. 1500) is one owing obedience to a mother abbey in a foreign country.

alien (n.)

"foreigner, citizen of a foreign land," early 14c., from alien (adj.) or from noun use of the adjective in French and Latin. In the science fiction sense "being from another planet," from 1953.

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Definitions of alien from WordNet
1
alien (n.)
a person who comes from a foreign country; someone who does not owe allegiance to your country;
Synonyms: foreigner / noncitizen / outlander
alien (n.)
anyone who does not belong in the environment in which they are found;
Synonyms: stranger / unknown
alien (n.)
a form of life assumed to exist outside the Earth or its atmosphere;
Synonyms: extraterrestrial being / extraterrestrial
2
alien (adj.)
not contained in or deriving from the essential nature of something;
an economic theory alien to the spirit of capitalism
Synonyms: foreign
alien (adj.)
being or from or characteristic of another place or part of the world;
alien customs
Synonyms: exotic
3
alien (v.)
transfer property or ownership;
The will aliened the property to the heirs
Synonyms: alienate
From wordnet.princeton.edu