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illegal alien

a foreigner who has entered or resides in a country unlawfully or without the country's authorization.
a foreigner who enters the U.S. without an entry or immigrant visa, especially a person who crosses the border by avoiding inspection or who overstays the period of time allowed as a visitor, tourist, or businessperson.
Compare resident alien.
Also called illegal immigrant. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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