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The direct connection of two or more information systems for the purpose of sharing data and other information resources.
the requirements for communication or interconnection by an ITsystem with one or more other IT systems or networks, to share processing capability or pass data and information in support of multi-organizational or public programs.
NIST SP 800-16 under System Interconnection
A direct connection between two or more systems in different authorization boundaries for the purpose of exchanging information and/or allowing access to information, information services, and resources.
NIST SP 800-47 Rev. 1