SI
/ˌesˈaɪ/ noun MEASURESDefinition
› abbreviation for Système International: a system of units of measurement used internationally. SI units include the metre, kilogram, second, ampere (= unit of electric current), candela (= unit of light), kelvin (= unit of temperature), and the mole (= unit of the amount of a substance): The chart shows you how to convert from a conventional unit to an SI unit.
› UK LAW statutory instrument
(Definition of SI noun from the Cambridge Business English Dictionary
© Cambridge University Press)
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