1.Definition: a form of life assumed to exist outside the Earth or its atmosphere

Related Noun(s):extraterrestrial, extraterrestrial being

Category: People

2.Definition: a person who comes from a foreign country; someone who does not owe allegiance to your country

Related Noun(s):foreigner, noncitizen, outlander

Category: People

3.Definition: anyone who does not belong in the environment in which they are found

Related Noun(s):stranger, unknown

Category: People