alien

{{11}}alien (adj.) mid-14c., "strange, foreign," from O.Fr. alien "alien, strange, foreign; an alien, stranger, foreigner," from L. alienus "of or belonging to another, foreign, alien, strange," also, as a noun, "a stranger, foreigner," adjectival form of alius " (an)other" (see ALIAS (Cf. alias)). Meaning "not of the Earth" first recorded 1920. An alien priory (c.1500) is one owing obedience to a mother abbey in a foreign country.

{{12}}alien (n.) "foreigner, citizen of a foreign land," from ALIEN (Cf. alien) (adj.). In the science fiction sense, from 1953.