I think that the general assumption of the meaning "alien" is "extraterrestrial being", which sometimes are "Martians" !INDEED. 🤔👽🤯😅 !WEIRD !HOPE !PEPE
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").
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