si unit

Noun si unit has 1 sense

• si unit(n = noun.quantity) international system, international system of units, si, si system, systeme international, systeme international d'unites - 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"
is a kind of metric system