atomic clock
noun
Simple Definition of atomic clock
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: a special kind of clock that is extremely exact
Source: Merriam-Webster's Learner's Dictionary
Full Definition of atomic clock
: a precision clock that depends for its operation on an electrical oscillator regulated by the natural vibration frequencies of an atomic system (as a beam of cesium atoms)
1938
First Known Use of atomic clock
1938
Learn More about atomic clock
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Britannica.com: Encyclopedia article about atomic clock
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