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atomic clock. an extremely accurate electronic clock regulated by the resonance frequency of atoms or molecules of certain substances, as cesium.
But i will give you a quotations for a better understanding. Similarly, in 1947 the experts from the Bulletin of the Atomic Scientists magazine of the University of Chicago instituted the so-called âDoomsday Clockâ â a symbolic reference point that has the purpose to show how close the world is to self-destruction.