SI unit

British

noun

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 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

SI unit Scientific

Any of the units of measure in the International System.
See more at International System

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SI unit

In the International System, the SI unit of speed is the metre per second.

From New York Times ● Sep. 22, 2016

His contributions to the field of thermodynamics were so significant that the SI unit of energy was named after him.

From Textbooks ● Aug. 12, 2015

The SI unit of pressure is pascal and 1 Pa = 1 N/m2 .

From Textbooks ● Aug. 12, 2015

The SI unit of density is kg/m3 , representative values are given in Table 11.1.

From Textbooks ● Aug. 12, 2015

The SI unit for I is watts per meter squared.

From Textbooks ● Aug. 12, 2015

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023