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  A simulated environment created by virtualization.
NIST SP 800-190 under Virtual machine from NIST SP 800-125

  Software that allows a single host to run one or more guest operating systems.
NIST SP 1800-25B under Virtual Machine from NIST SP 800-115
NIST SP 1800-26B under Virtual Machine from NIST SP 800-115

  A virtual data processing system that appears to be at the disposal of a particular user but whose functions are accomplished by sharing the resources of a real data processing system
NISTIR 8006 under Virtual machine from ISO/IEC 2382-1