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Definition of Karat
1. Noun. The unit of measurement for the proportion of gold in an alloy; 18-karat gold is 75% gold; 24-karat gold is pure gold. 
Definition of Karat
1. a unit of quality for gold [n -S]
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1. Noun. The unit of measurement for the proportion of gold in an alloy; 18-karat gold is 75% gold; 24-karat gold is pure gold. 
1. a unit of quality for gold [n -S]