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

 

SI

 abbreviation
abbreviation
BrE BrE//ˌes ˈaɪ//
 
; NAmE NAmE//ˌes ˈaɪ//
 
 
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International System (used to describe units of measurement; from French Système International) SI units
See the Oxford Advanced American Dictionary entry: SI

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