a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela) - Today the United States is the only country in the world not totally committed to the Systeme International d'Unites • Syn: Systeme International d'Unites, SI system, SI, SI unit, International System of Units, International System • Hypernyms: metric system