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English definition of “carat”

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noun [C] uk   /ˈkær.ət/ us    /ˈker-/ ( written abbreviation ct.)
a unit for measuring the weight of jewels (= precious stones) UK ( US karat) a unit for measuring how pure gold is: 24-carat gold is the purest.
(Definition of carat from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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