Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A unit of measure for the fineness of gold, equal to 1/24 part. Pure gold is 24 karat; gold that is 50 percent pure is 12 karat.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A unit of fineness or concentration of gold equalling 1/24 part of gold in an alloy.

from the GNU version of the Collaborative International Dictionary of English

  • n. the unit of measurement for the proportion of gold in an alloy; 18-karat gold is 75 2.122e-314old; 24-karat gold is pure gold.

from The Century Dictionary and Cyclopedia

  • n. See carat.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the unit of measurement for the proportion of gold in an alloy; 18-karat gold is 75% gold; 24-karat gold is pure gold

Etymologies

Variant of carat.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English, from Middle French carat, from Medieval Latin carratus. (Wiktionary)

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