SI unit

SI unit noun

1. See under International System of Units.

British Dictionary definitions for si unit 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 in Science SI unit

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