None
A characteristic of a condition, such as value, rate, periodicity, or amplitude, exhibiting only negligible change over an arbitrarily long period of time.
Source(s):
NIST SP 800-82 Rev. 2
ANSI/ISA-51.1-1979
an asset or part of an asset that has been delivered and is performing the mission.
Source(s):
NIST SP 800-65
[Withdrawn]