Si unit

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Any unit of the International System of Units.
  2. 2
    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) wordnet