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).
Source(s):
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.
Source(s):
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
NIST SP 800-82 Rev. 2 under Denial of Service (DoS) from RFC 4949

  The prevention of authorized access to resources or the delaying of time-critical operations.
Source(s):
NISTIR 7711 under Denial of Service
NIST SP 800-33 [Withdrawn] under denial of service

  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.)
Source(s):
CNSSI 4009-2015 [Superseded] from NIST SP 800-27 Rev. A

  actions that prevent the NE from fimctioning in accordance with its intended purpose. A piece of equipment or entity may be rendered inoperable or forced to operate in a degraded state; operations that depend on timeliness may be delayed.
Source(s):
NIST SP 800-13 [Withdrawn] under Denial of service

  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.)
Source(s):
NIST SP 800-27 Rev. A [Withdrawn] under denial of service