atomic time


atomic time

A time system that operates at a constant rate and that is measured by means of an atomic clock. The definition of the second has been in terms of atomic time since 1967. See also International Atomic Time.

atomic time

[ə′täm·ik ‚tīm] (horology) Any time system standardized with reference to an atomic resonance, such as the international standard cesium-133 transition.