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.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Your illegal alien example doesn't work because they shouldn't have the free
  will to do anything but leave the country.
In the majority of these illegal alien havens, the prosecution of these people
  has waned.
He was arrested on a charge of being an illegal alien in possession of a
  firearm.
The purpose of this amendment is to change the way income of an illegal alien
  is counted.
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