from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An extremely precise timekeeping device regulated in correspondence with a characteristic invariant frequency of an atomic or molecular system.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun An extremely accurate reference
clockwhose operation is based on an atomic process, typically the frequency of electromagnetic radiationassociated with a specified energy-level transition in an element such as cesium.
- noun proscribed A
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a timepiece that derives its time scale from the vibration of atoms or molecules
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