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|Noun||1.||SI system - 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"|
International System, International System of Units, SI unit, Systeme International, Systeme International d'Unites, SI
metric system - a decimal system of weights and measures based on the meter and the kilogram and the second