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DoS

Definitions:

  The prevention of authorized access to resources or the delaying of time-critical operations. (Time-critical may be milliseconds or it may be hours, depending upon the service provided).
Sources:
NIST SP 800-12 Rev. 1 under Denial of Service from CNSSI 4009

  The prevention of authorized access to a system resource or the delaying of system operations and functions.
Sources:
NIST SP 1800-15B under Denial of Service from NIST SP 800-82 Rev. 2
NIST SP 1800-15C under Denial of Service from NIST SP 800-82 Rev. 2

  The prevention of authorized access to resources or the delaying of time-critical operations.
Sources:
NISTIR 7711 under Denial of Service