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English definition of “SI unit”

SI unit

noun [C] uk   /ˌesˈaɪˌjuː.nɪt/ specialized us  
a unit of measurement that is part of a system used for scientific and technical work all over the world: The SI unit of length is the metre.
(Definition of SI unit from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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