Usually means: Accurate atomic clock using caesium.
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We found 10 dictionaries that define the word caesium clock:

General (10 matching dictionaries)
  1. caesium clock: Oxford Learner's Dictionaries
  2. caesium clock: Collins English Dictionary
  3. caesium clock: Vocabulary.com
  4. caesium clock: Dictionary.com
  5. Caesium clock: Wikipedia, the Free Encyclopedia
  6. caesium clock: Rhymezone
  7. caesium clock: FreeDictionary.org
  8. caesium clock: Mnemonic Dictionary
  9. caesium clock: TheFreeDictionary.com
  10. caesium clock: Wiktionary

(Note: See caesium_clocks as well.)

Definitions from Wiktionary (caesium clock)

noun:  A type of highly accurate atomic clock that is regulated by a resonance frequency of caesium atoms (the same frequency, 9,192,631,770 Hz, on which the precise scientific definition of the second is based).

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