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Definition SI unit in British English

SI unit noun

[countable] noun
/ˌes ˈaɪ ˌjuːnɪt/
1

Système International unit: a standard scientific unit of measurement in an international system. The main units are the metre, kilogram, second, ampere, kelvin, and mole.

Synonyms and related words
absolute calibration exa-
Definition SI unit in British English