Computer programs and data stored in hardware - typically in read-only memory (ROM) or programmable read-only memory (PROM) - such that the programs and data cannot be dynamically written or modified during execution of the programs.
Sources:
CNSSI 4009-2015 under firmware from IETF RFC 4949 Ver 2
NIST SP 800-37 Rev. 2 under firmware from CNSSI 4009-2015
NIST SP 800-53A Rev. 5 under firmware from CNSSI 4009-2015

  Computer programs and associated data that may be dynamically written or modified during execution.
Sources:
NIST SP 800-37 Rev. 2 from CNSSI 4009-2015
NIST SP 800-53 Rev. 5 from CNSSI 4009-2015
NIST SP 800-53A Rev. 5 from CNSSI 4009-2015
NISTIR 7693 under Software

  The material physical components of a system. See software and firmware.
Sources:
NIST SP 800-172 under hardware
NIST SP 800-172A under hardware
NIST SP 800-37 Rev. 2 under hardware from CNSSI 4009-2015
NIST SP 800-53 Rev. 5 under hardware from CNSSI 4009-2015
NIST SP 800-53A Rev. 5 under hardware from CNSSI 4009-2015
NIST SP 800-171 Rev. 2 under hardware from CNSSI 4009

  The material physical components of an information system. See firmware and software.
Sources:
CNSSI 4009-2015 under hardware from IETF RFC 4949 Ver 2

  Computer programs (which are stored in and executed by computer hardware) and associated data (which also is stored in the hardware) that may be dynamically written or modified during execution.
Sources:
CNSSI 4009-2015 from IETF RFC 4949 Ver 2

  Computer programs and data stored in hardware - typically in read-only memory (ROM) or programmable read-only memory (PROM) - such that the programs and data cannot be dynamically written or modified during execution of the programs. See hardware and software.
Sources:
NIST SP 800-53 Rev. 5 under firmware from CNSSI 4009-2015
NIST SP 800-171 Rev. 2 under firmware from CNSSI 4009

  Computer programs and data stored in hardware—typically in read-only memory (ROM) or programmable read-only memory (PROM)—such that programs and data cannot be dynamically written or modified during execution of the programs. See hardware and software.
Sources:
NIST SP 800-172 under firmware
NIST SP 800-172A under firmware

  Computer programs and associated data that may be dynamically written or modified during the device’s execution (e.g., application code, libraries).
Sources:
NIST SP 800-213 under Software from NIST SP 800-53 Rev. 5 - Adapted
NISTIR 8259B under Software

  See hardware and software.
Sources:
NIST SP 800-53A Rev. 5 under firmware

  All or part of the programs, procedures, rules, and associated documentation of an information processing system.
Sources:
NISTIR 7695 under Software from ISO/IEC 19770-2

  “Computer programs and associated data that may be dynamically written or modified during the device’s execution”
Sources:
NISTIR 8259A under Software