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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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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 nationsAbbreviation: TAI
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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