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belonging to a foreign country or nation. unfamiliar and disturbing or distasteful:bossing anyone around was alien to him they found the world of adult education a little alien [attributive] relating to or denoting beings supposedly from other worlds; extraterrestrial:an alien spacecraft (of a plant or animal species) introduced from another country and later naturalized.
a foreigner, especially one who is not a naturalized citizen of the country where they are living:an illegal alien a hypothetical or fictional being from another world. a plant or animal species originally introduced from another country and later naturalized.