Reciprocity - Recognition and acceptance, without further processing of: (1) security background investigations and clearance eligibility determinations. (2) accreditations of information systems; and (3) facility accreditations. Reciprocity is obligatory in the Intelligence Community when there are no waivers, conditions, or deviations to the Director of National Intelligence.
NIST SP 800-53r3
Reciprocity - Mutual agreement among participating enterprises to accept each other's security assessments in order to reuse information system resources and/or to accept each other's assessed security posture in order to share information.