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illegal alien

noun
1.
a foreigner who has entered or resides in a country unlawfully or without the country's authorization.
2.
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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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