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English definition of “SI”

SI

noun     /ˌesˈaɪ/ MEASURES
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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