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The specific system elements, boundaries, interconnections, interactions, and operational environment that define a system.
NIST SP 800-160v1r1
Comments about specific definitions should be sent to the authors of the linked Source publication. For NIST publications, an email is usually found within the document.
Comments about the glossary's presentation and functionality should be sent to firstname.lastname@example.org.
See NISTIR 7298 Rev. 3 for additional details.