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atomic clock

 

Definitions from WordNet

Noun atomic clock has 1 sense
  1. atomic clock - a timepiece that derives its time scale from the vibration of atoms or molecules
    --1 is a kind of
    timepiece, timekeeper
    --1 has particulars: ammonia clock; caesium clock

Definitions from the Web

Atomic Clock

Noun: An extremely accurate clock that uses the vibrations of atoms to measure time.

Example Sentence: The atomic clock at the laboratory is so precise that it only loses one second every million years.


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