Jisho

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こくさいたんけい 国際単位系
Noun
1. International System of Units; SISee also SI
Wikipedia definition
2. International System of UnitsThe International System of Units (abbreviated SI from French: Système international d'unités) is the modern form of the metric system and is generally a system of units of measurement devised around seven base units and the convenience of the number ten. The older metric system included several groups of units. The SI was established in 1960, based on the metre-kilogram-second system, rather than the centimetre-gram-second system, which, in turn, had a few variants.
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