international system of units meaning and definition

INTERNATIONAL SYSTEM OF UNITS noun

Definition of International System of Units (noun)

1. 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"
   • synonyms: International System, SI, SI system, SI unit, Systeme International, Systeme International d'Unites