
Dictionary » S » Si unit Si unitSI unit (Science: chemistry, physics) An international system of units of measurement in which the fundamental units are standardised. Examples include: metre, kilometre, ampere, gray, joule, sievert, becquerel. Origin: Fr. Le Systeme International d'Unites A unit of measurement using a particular scale, e.g. centimetres, kilograms. ![]()
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