Also found in: Thesaurus, Medical, Legal, Financial, Encyclopedia, Wikipedia.
(Units) any of the units adopted for international use under the Système International d'Unités, now employed for all scientific and most technical purposes. There are seven fundamental units: the metre, kilogram, second, ampere, kelvin, candela, and mole; and two supplementary units: the radian and the steradian. All other units are derived by multiplication or division of these units without the use of numerical factors
any of the basic units of measure in the International System of Units.
Switch to new thesaurus
|Noun||1.||SI unit - 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 system, 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