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Definition of Atomic clock
1. Noun. A timepiece that derives its time scale from the vibration of atoms or molecules.
Definition of Atomic clock
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. ¹
2. Noun. (proscribed) A radio clock. ¹
¹ Source: wiktionary.com