atomic clock

noun

: a precision clock that depends for its operation on an electrical oscillator regulated by the natural vibration frequencies of an atomic system (such as a beam of cesium atoms)

Examples of atomic clock in a Sentence

Recent Examples on the Web
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Rubidium is found in the earth’s crust alongside lithium and is used in technologies such as atomic clocks, motion sensors, signal generators, and GPS equipment—technologies that all rely on the hyperfine transition of electrons in rubidium atoms to keep time. IEEE Spectrum, 11 Feb. 2025 However, compared to a quantum clock, atomic clocks are as accurate as a one-dollar antique pocket watch that's been whacked several times with a coal hammer. David Szondy, New Atlas, 12 Jan. 2025 At their core, atomic clocks and nuclear clocks work using the same principle. Allison Parshall, Scientific American, 11 Sep. 2024 And make no mistake, even cesium atomic clocks are stunningly accurate. IEEE Spectrum, 24 June 2021 See All Example Sentences for atomic clock

Word History

First Known Use

1924, in the meaning defined above

Time Traveler
The first known use of atomic clock was in 1924

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Cite this Entry

“Atomic clock.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/atomic%20clock. Accessed 22 Apr. 2025.

Kids Definition

atomic clock

noun
: an extremely exact clock that depends for its operation on the natural vibrations of atoms (as of cesium)

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