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  A collection of realms (domains) that have established trust among themselves. The level of trust may vary, but typically includes authentication and may include authorization.
NIST SP 800-160 Vol. 2 from NIST SP 800-95
NIST SP 800-95 under Federation from Web Services Federation Language (WS-Federation) (Version 1.0, 8 July 2003)

  A process that allows the conveyance of identity and authentication information across a set of networked systems.
NIST SP 800-63-3 under Federation