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.