definition of
alien

[1] #1 alien s. [foreign] not contained in or deriving from the essential nature of something; "an economic theory alien to the spirit of capitalism"; "the mysticism so foreign to the French mind and temper"; "jealousy is foreign to her nature". wn

[2] #2 alien n. [foreigner, noncitizen, outlander] a person who comes from a foreign country; someone who does not owe allegiance to your country. wn

[3] #3 alien s. [exotic] being or from or characteristic of another place or part of the world; "alien customs"; "exotic plants in a greenhouse"; "exotic cuisine". wn

[4] #4 alien v. [alienate] transfer property or ownership; "The will aliened the property to the heirs". wn

[5] #5 alien n. [stranger, unknown] anyone who does not belong in the environment in which they are found. wn