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. 2013.
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Illegal alien is always a great word to know.
So is callithumpian. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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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.
The purpose of this amendment is to change the way income of an illegal alien
  is counted.
He was arrested on a charge of being an illegal alien in possession of a
  firearm.
The employer has not knowingly hired an illegal alien.
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