What is the meaning of alien?

noun

• A person who comes from a foreign country; someone who does not owe allegiance to your country.
  • synonyms: foreigner, noncitizen, outlander
• Anyone who does not belong in the environment in which they are found.
  • synonyms: stranger, unknown
• A form of life assumed to exist outside the Earth or its atmosphere.
  • synonyms: extraterrestrial being, extraterrestrial

verb

• Transfer property or ownership.
  • usage: "The will aliened the property to the heirs"
  • synonyms: alienate
• Arouse hostility or indifference in where there had formerly been love, affection, or friendliness.
  • usage: "She alienated her friends when she became fanatically religious"
  • synonyms: estrange, alienate, disaffect

adjective

• Not contained in or deriving from the essential nature of something.
  • usage: "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"
  • synonyms: foreign
• Being or from or characteristic of another place or part of the world.
  • usage: "alien customs"; "exotic plants in a greenhouse"; "exotic cuisine"
  • synonyms: exotic