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alien legal definition

noun

One who is not a citizen, national, or subject of a particular country.
One who is not a citizen, national, or subject of the country in which he resides.
One who is born in or owes his allegiance to a foreign country.

deportable alien

An alien who may be deported because she was an inadmissible alien when she entered the United States or has violated the regulations (for example, by committing a serious crime) governing the conduct of aliens who are within the country.

illegal alien

An alien who enters or remains in the United States without legal authorization or by fraud.
An alien who marries an American citizen, but with no intention of living with his or her spouse as husband and wife, for the purpose of improperly entering the United States or avoiding deportation.

inadmissible alien

An alien who cannot legally enter the United States. There are many reasons why an alien may be prohibited from entry, including a criminal record or poor health.