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international atomic time

noun
1.
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.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for inter national atomic time

International Atomic Time

noun
1.
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
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