Any organized assembly of resources and procedures united and regulated by interaction or interdependence to accomplish a set of specific functions. Note: Systems also include specialized systems such as industrial/process controls systems, telephone switching and private branch exchange (PBX) systems, and environmental control systems.
Sources:
NIST SP 800-12 Rev. 1 under System

  See information system.
Sources:
NIST SP 800-128 under System
NIST SP 800-137 under System
NIST SP 800-18 Rev. 1 under System
NIST SP 800-30 Rev. 1 under System
NIST SP 800-39 under System
NIST SP 800-60 Vol. 1 Rev. 1 under System
NIST SP 800-60 Vol. 2 Rev. 1 under System

  A discrete set of resources that are organized for the collection, processing, maintenance, use, sharing, dissemination, or disposition of information.
Sources:
NIST SP 800-57 Part 1 Rev. 5 under System

  A combination of interacting elements organized to achieve one or more stated purposes.
Sources:
NISTIR 7622 under System

  Combination of interacting elements organized to achieve one or more stated purposes.
Sources:
NISTIR 8062 under System from ISO/IEC 15288

  A specific IT installation, with a particular purpose and operational environment.
Sources:
NISTIR 5153 under System from ITSEC Ver. 1.2

  Discrete set of information resources organized for the collection, processing, maintenance, use, sharing, dissemination, or disposition of information.
Sources:
NISTIR 7693 under System

  See Information System
Sources:
NISTIR 8170 under System

  A discrete set of information resources organized expressly for the collection, processing, maintenance, use, sharing, dissemination, or disposition of information.
Sources:
NISTIR 8286 under System