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Latin word alienus comes from Proto-Indo-European *h₂el-, and later Proto-Indo-European *h₂élyos (Other, another.)
*h₂el- (Proto-Indo-European)
*h₂élyos (Proto-Indo-European)
Other, another.
*aljos (Proto-Italic)
alius (Latin)
Else. Other, another.
alienus (Latin)
(of the body) dead; corrupted; paralyzed. (of the mind) insane, mad. Of that which belongs to another person, place, or object—of another, alien, foreign. Unfamiliar with something or a stranger to something. Unfriendly, inimical, hostile, suspicious. Unsuitable, incongruous, inconsistent.