A person who has immigrated legally but is not an American citizen. This person has been admitted to the U. S. as an immigrant and has a Permanent Resident Card, Form I-551 (formerly called Alien Registration Card, also known as green card). It is a wallet-sized card showing that the person is a lawful permanent resident (immigrant) in the U. S. Learn more about Lawful Permanent Residents, including how to replace or renew a Permanent Resident Card, on the USCIS Website. Learn about requirements for entry into the U. S. on the CBP website. This person may also be called a legal permanent resident, a green card holder, a permanent resident alien, a legal permanent resident alien (LPRA) and resident alien permit holder.