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A citizen of the United States or an alien lawfully admitted for permanent residence. Agencies may, consistent with individual practice, choose to extend the protections of the Privacy Act and E-Government Act to businesses, sole proprietors, aliens, etc.
NIST SP 800-60 Vol. 1 Rev. 1
NIST SP 800-60 Vol. 2 Rev. 1
A single person or a group of persons, including at a societal level.
NIST Privacy Framework Version 1.0