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From: WordNet (r) 2.0

 SI system
      n : 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, Systeme
          International, SI, International System of Units, International
          System]