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Definition of SI abbreviation from the Oxford Advanced Learner's Dictionary

SI

abbreviation
 
/ˌes ˈaɪ/
 
/ˌes ˈaɪ/
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  1. International System
    (a system of measurements based on the metric system with standard basic units; from French ‘Système International’)
    • SI units
    Topics Maths and measurementc2
See SI in the Oxford Advanced American Dictionary
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noun
 
 
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