International System of Units

noun

1. an internationally accepted coherent system of physical units, derived from the MKSA (meter-kilogram-second-ampere) system, using the meter, kilogram, second, ampere, kelvin, mole, and candela as the basic units SI unitsSI unit respectively of the fundamental quantities of length, mass, time, electric current, temperature, amount of substance, and luminous intensity. : SI

Word History and Origins

Origin of International System of Units¹

First recorded in 1930–35; translation of the earlier French name Système Internationale d'Unités