overstay. n. Defined by the Department of Homeland Security as "a nonimmigrant who was lawfully admitted to the United States for an authorized period but stayed or remains in the United States beyond his or her lawful admission period.
DHS identifies two types of overstays—those individuals for whom no departure has been recorded (Suspected In-Country Overstay) and those individuals whose departure was recorded after their lawful admission period expired (Out-of-Country Overstay). The overstay identification process is conducted through arrival, departure and immigration status information, consolidated to generate a complete picture of individuals traveling to the United States."
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