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international atomic time

a system of measuring time based on atomic clocks that measure the second as the basic unit of time in the International System of Units (SI).
Abbreviation: IAT. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for international atomic time

International Atomic Time

the scientific standard of time based on the SI unit, the second, used by means of atomic clocks and satellites to synchronize the time standards of the major nations TAI
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for international atomic time
noun's 21st Century Lexicon
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