Alien meaning : Any life form of extraterrestrial or extradimensional origin. A person, animal, plant, or other thing which is from outside the family, group, organization, or territory under consideration. A foreigner residing in a country. One excluded from certain privileges; one alienated or estranged. To estrange; to alienate. To transfer the ownership of something. Not belonging to the same country, land, or government, or to the citizens or subjects thereof; foreign. Very unfamiliar, strange, or removed. Pertaining to extraterrestrial life.