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karat

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kar⋅at

  [kar-uht]
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–noun
a unit for measuring the fineness of gold, pure gold being 24 karats fine. Abbreviation: k., kt.
Also, carat.

Origin:
1550–60; sp. var. of carat
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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kar·at also car·at   (kār'ət)   
n.   Abbr. k or kt.
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.

[Variant of carat.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

karat 
variant of carat (q.v.). In U.S., karat is used for "proportion of fine gold in an alloy" and carat for "weight of a precious stone."
Online Etymology Dictionary, © 2001 Douglas Harper
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Financial Dictionary

karat

A measure of the purity of gold. Pure gold is indicated by the label 24 karat. See also fineness.

Wall Street Words: An A to Z Guide to Investment Terms by David L. Scott.
Copyright © 2003. Published by Houghton Mifflin.
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Encyclopedia

karat

a measure of the fineness (i.e., purity) of gold. It is spelled carat outside the United States but should not be confused with the unit used to measure the weight of gems, also called carat. A gold karat is 124 part, or 4.1667 percent, of the whole, and the purity of a gold alloy is expressed as the number of these parts of gold it contains. Thus, an object that contains 16 parts gold and 8 parts alloying metal is 16-karat gold, and pure gold is 24-karat gold.

Learn more about karat with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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