atomic clock

1. 1.

   a timepiece that derives its time scale from the vibration of atoms or molecules

   Broadertimepiece

   Narrowerammonia clockcaesium clock

Questions about atomic clock

What does atomic clock mean?

atomic clock means "a timepiece that derives its time scale from the vibration of atoms or molecules".

Is atomic clock a common word?

atomic clock is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.