[n] a form of life assumed to exist outside the Earth or its atmosphere
[n] a person who comes from a foreign country; someone who does not owe allegiance to your country
[n] anyone who does not belong in the environment in which they are found
[adj] being or from or characteristic of another place or part of the world; "alien customs"; "exotic plants in a greenhouse"; "moved to a strange country"
[adj] 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"
[v] arouse hostility or indifference in where there had formerly been love, affection, or friendliness