The noun alien has 3 senses (first 1 from tagged texts)
1. (2) foreigner, alien, noncitizen, outlander -- (a person who comes from a foreign country; someone who does not owe allegiance to your country)
2. stranger, alien, unknown -- (anyone who does not belong in the environment in which they are found)
3. extraterrestrial being, extraterrestrial, alien -- (a form of life assumed to exist outside the Earth or its atmosphere)
Overview of verb alien
The verb alien has 2 senses (no senses from tagged texts)
1. alien, alienate -- (transfer property or ownership; "The will aliened the property to the heirs")
2. estrange, alienate, alien, disaffect -- (arouse hostility or indifference in where there had formerly been love, affection, or friendliness; "She alienated her friends when she became fanatically religious")
Overview of adj alien
The adj alien has 2 senses (first 2 from tagged texts)
1. (3) alien, 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")
2. (2) alien, exotic -- (being or from or characteristic of another place or part of the world; "alien customs"; "exotic plants in a greenhouse"; "exotic cuisine")