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

SI unit

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

2. See more at International System

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.

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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.

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

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

Read more on Nature