Definitions for "Atomic clock"
Clock that records time by vibrating cesium-133 atoms
A clock whose rate is controlled by the frequency of an internal motion within an atom. Time is now defined by a particular motion of an electron and nucleus within the cesium atom: the second is the interval for exactly 9,192,631,770 cycles of this motion.
An extremely accurate clock that is based on the vibrations of an atom or molecule. For more information see How atomic clocks work (How Stuff Works, USA); The most accurate clocks in the world (Miami University, USA); How atomic clocks work (Science Museum, UK).
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