1. noun /ˈeɪ.li.ən/
a) A person, animal, plant, or other thing which is from outside the family, group, organization, or territory under consideration.
An alien born may purchase lands, or other estates: but not for his own use; for the king is thereupon entitled to them.
The counsel have shown conclusively that they are not a state of the union, and have insisted that individually they are aliens, not owing allegiance to the United States.
See Also: alienage, space alien
2. adjective /ˈeɪ.li.ən/
a) Pertaining to an alien.
3. verb /ˈeɪ.li.ən/
Wikipedia foundation.