| si unit | |
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); "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] |
| SI unit
Any of the units of measure in the International System. See more at International System. |