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''The following article is about the term alien as most commonly used. For the term applying to hypothesized other forms of life in the universe see:'' [[Extraterrestrial life]]

''The following article is about the term "alien" as it most commonly used. For use of the term applying to hypothesized forms of life on other planets see:'' [[Extraterrestrial life]]

An '''alien''' is a person who is of another family, race, nation than the people among whom he or she lives. In [[United States]] legal terminology, anyone who is not an American citizen is an alien.

An '''alien''' is a person who is a member of another family, race, or nation than the people among whom he or she lives. In [[American]] legal terminology, anyone who is not an American citizen is classified as an alien.

An alien is a foreign-born person who has not qualified as a citizen of the country. [[category:legal terms]]

An alien is a foreign-born person who has not qualified as a citizen of the country in which he or she lives. [[category:legal terms]]