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A global domain within the information environment consisting of the interdependent network of information systems infrastructures including the Internet, telecommunications networks, computer systems, and embedded processors and controllers.
NIST SP 800-30 Rev. 1 under Cyberspace CNSSI 4009
NIST SP 800-39 under Cyberspace CNSSI 4009
NIST SP 800-53 Rev. 4 under Cyberspace CNSSI 4009
The interdependent network of information technology infrastructures, and includes the Internet, telecommunications networks, computer systems, and embedded processors and controllers in critical industries.
NIST SP 800-160 Vol.2
the complex environment resulting from the interaction of people, software and services on the Internet by means of technology devices and networks connected to it, which does not exist in any physical form.
NISTIR 8074 Vol. 2 under Cyberspace