a person who has entered or attempted to enter a country illegally
She had hired an illegal alien as a maid.
Examples of 'illegal alien' in a sentence
illegal alien
For another eight minutes had gone by and, with it, another illegal alien.
Times, Sunday Times (2008)
As such, the refugees find themselves as illegal aliens.
Times, Sunday Times (2007)
Six million other illegal aliens will not be protected.
Times, Sunday Times (2014)
State and city jurisdictions with large numbers of illegal aliens passed law after law to minimise or eliminate the distinction between legal and illegal status.