SI unit

British  

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

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SI unit Scientific  

1. Any of the units of measure in the International System.

2. See more at International System

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Example Sentences

It is arguably the most significant redefinition of an SI unit since the second was recalculated in 1967, a decision that helped ease communication across the world via technologies like GPS and the internet.

From Reuters

For example, radians could be made a new SI unit, and the unit 1 could be formally coupled with notation that includes the type of quantity that it represents.

From Nature

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

From New York Times

The kilogram is the only SI unit still based on a physical object.

From Nature