"alien" in the noun sense
1. 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
"alien" in the verb sense
1. alien, alienate
transfer property or ownership
"The will aliened the property to the heirs"
"alien" in the adjective sense
1. 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. alien, exotic
being or from or characteristic of another place or part of the world
"exotic plants in a greenhouse"
Source: WordNet® (An amazing lexical database of English)
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