KARAT Meaning of KARAT in English /kar"euht/ , n.a unit for measuring the fineness of gold, pure gold being 24 karats fine. Abbr.: k., kt. Also, carat . [ 1550-60; sp. var. of CARAT ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012