international system of units
noun
- a system of physical units (SI Units) based on the metre, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten国际单位制（以米、千克、秒、安培、开、勘德拉及摩尔为基础的物理单位以及表示其十进制的词头）。
词源
translating French Système International d'Unités.