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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 international 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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for international atomic time
noun

See atomic time

Dictionary.com's 21st Century Lexicon
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international atomic time in Technology
time, standard
(TAI) An international standard measurement of time based on the comparison of many atomic clocks. TAI is maintained by the Bureau International des Poids et Mesures (BIPM), the world's governing body for civil atomic time measurement. TAI is the basis for Coordinated Universal Time.
BIPM (http://bipm.fr/enus/5_Scientific/c_time/time_1.html).
(2001-08-02)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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