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SI unit

noun
1.
any of the units adopted for international use under the Système International d'Unités, now employed for all scientific and most technical purposes. There are seven fundamental units: the metre, kilogram, second, ampere, kelvin, candela, and mole; and two supplementary units: the radian and the steradian. All other units are derived by multiplication or division of these units without the use of numerical factors
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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si unit in Science
SI unit  
Any of the units of measure in the International System. See more at International System.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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