international system of units Meaning, Definition & Usage

1. noun 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)
   Systeme International; SI unit; SI system; International System; SI; Systeme International d'Unites.
   
   • Today the United States is the only country in the world not totally committed to the Systeme International d'Unites

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