a person who comes to settle in a country without the legal permission of its government. The expression "illegal alien" is considered a pejorative.
A person who comes to a country for residence without the required documentation.
an immigrant with no documentation on him, which may or may not make him an illegal immigrant depending on the circumstances
a person who has no documents evidencing that he or she has applied to the BCIS to legalize his or her status in this country
a person who is present in the United States without the permission of the U
A person who enters or stays in a country without legal permission. Also called illegal alien.