coordinated uni-versal time

coordinated universal time

noun
Greenwich Time that is adjusted to minimize its divergence from international atomic time. Abbreviation: UTC
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American Heritage
Science Dictionary
coordinated universal time   (kō-ôr'dn-ā'tĭd)  Pronunciation Key 
A highly accurate time scale based on time measured by an atomic clock. Because coordinated universal time is unaffected by the gradual slowing of Earth's rotation, leap seconds are added as needed to synchronize it with the sidereal (rotation-based) universal time. Coordinated universal time is used internationally for scientific and technical purposes. Compare universal time.
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