The process of making a person’s identity known to the PIV system, associating a unique identifier with that identity, and collecting and recording the person’s relevant attributes into the system. In some other NIST documents, such as [NIST SP 800-63A], identity registration is referred to as enrollment.
Sources:
FIPS 201-3 under Identity Registration

  The process through which a party applies to become a subscriber of a credentials service provider (CSP) and a registration authority validates the identity of that party on behalf of the CSP.
Sources:
CNSSI 4009-2015

  The process through which an applicant applies to become a subscriber of a CSP and the CSP validates the applicant’s identity.
Sources:
NIST SP 800-63-3 under Enrollment

  See Enrollment.
Sources:
NIST SP 800-63-3 under Registration

  Making a person’s identity known to the enrollment/Identity Management System information system by associating a unique identifier with that identity, and collecting and recording the person’s relevant attributes into the information system. Registration is necessary in order to initiate other processes, such as adjudication, card/token personalization and issuance and, maintenance that are necessary to issue and to re-issue or maintain a PIV Card or a Derived PIV Credential token.
Sources:
NIST SP 800-79-2 under Registration

  The process that a CA uses to create a certificate for a web server or email user. (In the context of this practice guide, enrollment applies to the process of a certificate requester requesting a certificate, the CA issuing the certificate, and the requester retrieving the issued certificate.)
Sources:
NIST SP 1800-16B under Enrollment from NISTIR 7682

  The process that a CA uses to create a certificate for a web server or email user. (In the context of this practice guide, enrollment applies to the process of a certificate requester requesting a certificate, the CA issuing the certificate, and the requester retrieving the issued certificate).
Sources:
NIST SP 1800-16C under Enrollment from NISTIR 7682

  The assignment of a name to an object.
Sources:
NISTIR 5308 from ISO/IEC JTC1 N820

  The process through which an applicant applies to become a subscriber of a CSP and an RA validates the identity of the applicant on behalf of the CSP. (NIST SP 800-63-3)
Sources:
NISTIR 8149 under Registration from NIST SP 800-63-3

  The process that a Certificate Authority (CA) uses to create a certificate for a web server or email user
Sources:
NISTIR 7682 under Enrollment