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

• karat
• kt

1. (noun) a unit of weight for precious stones = 200 mg

• metric weight unit
• weight unit

2. (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

• unit
• unit of measurement