Collins Concise English Dictionary © HarperCollins Publishers::
International Atomic Time n
  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
WordReference Random House Unabridged Dictionary of American English © 2026
interna′tional atom′ic time′, 
  1. Timea system of measuring time based on atomic clocks that measure the second as defined as the SI unit of time. Abbr.: IAT

'International Atomic Time' also found in these entries (note: many are not synonyms or translations):
TAI - universal time - IAT - universal time coordinated

Forum discussions with the word(s) "International Atomic Time" in the title:


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