SI units yekâhâ-ye SI Fr.: Système International A coherent and rationalized system of units, in common use in physics since 1969. The seven basic units are the → meter, the → kilogram, the → second, the → ampere, the → kelvin, the → mole, and the → candela. Same as international system of units. SI, from Fr. Système Internationale d'unités; → unit. |