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International system of units

system of units, based on the International System of Quantities, their names and symbols, including a series of prefixes and their names and symbols, together with rules for their use (International Vocabulary of Metrology)

Pronunciation
/ɪntəˈnaʃənəl ˈsɪstəm əv ˈjuːnɪts/
/ˌɪntərˈnæʃənəl ˈsɪstəm əv ˈjunəts/