atomic clock

About 0.06 uses per million words.

Meaning

1. noun An extremely accurate reference clock whose operation is based on an atomic process, typically the frequency of electromagnetic radiation associated with a specified energy-level transition in an element such as cesium.
2. noun A radio clock.

Similar words

caesium clock atomic time lightclock light clock space-time crystal atomic battery clocktime time crystal absolute time proper time

Word family

atomic clocks