atomic clock

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.
(proscribed) A radio clock.

master clock

orologio atomico

ساعة ذرية

rellotge atòmic

Relógio atómico

ατομικό ρολόι

atom saati

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