What is Aggravated Felony?

Legal Definition
The term aggravated felony is used in the United States immigration law to refer to a broad category of criminal offenses that carry certain severe consequences for aliens seeking asylum, legal permanent resident status, citizenship, or avoidance of deportation proceedings. Anyone convicted of an aggravated felony and removed from the United States "must remain outside of the United States for twenty consecutive years from the deportation date before he or she is eligible to re-enter the United States."
-- Wikipedia