NIST IR 7298
Security Authorization - The official management decision given by a senior agency official to authorize operation of an information system and to explicitly accept the risk to agency operations (including mission, functions, image, or reputation), agency assets, or individuals, based on the implementation of an agreed-upon set of security controls. SOURCE: SP 800-37
NIST SP 800-37
Security Authorization - See Accreditation.
NIST SP 800-53r3
Security Authorization - See Authorization.