caesium clock

British

noun

a type of atomic clock that uses the frequency of radiation absorbed in changing the spin of electrons in caesium atoms See also second 2

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It was here in the 1930s that the physicist Louis Essen developed the first quartz ring clock, the most accurate timepiece of its day, and a precursor of the caesium clock.

From BBC • Oct. 3, 2014

Without the caesium clock, for example, satellite navigation would be impossible.

From BBC • Oct. 3, 2014

It's because this transition frequency is so much higher than the resonant frequency of quartz that a caesium clock is so much more accurate.

From BBC • Oct. 3, 2014

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