International System of Units

In·ter·na·tion·al System of Units

noun \ˌint-ər-ˈnash-nəl-, -ən^əl-\

Definition of INTERNATIONAL SYSTEM OF UNITS

: an internationally accepted system of units based on the metric system and having the meter, kilogram, second, ampere, kelvin, mole, and candela as base units, the radian and steradian as supplementary units, and deriving all other units from these—abbreviation SI; called also International System