noun Statistics.
the state or quality of flatness or peakedness of the curve describing a frequency distribution in the region about its mode.

1900–05; irregular transliteration of Greek kýrtōsis curvature. See cyrtosis

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World English Dictionary
kurtosis (kəˈtəʊsɪs)
statistics platykurtic mesokurtic See also leptokurtic Compare skewness a measure of the concentration of a distribution around its mean, esp the statistic B2 = m4/m2² where m2 and m4 are respectively the second and fourth moment of the distribution around the mean. In a normal distribution B2 = 3
[from Greek: curvature, from kurtos arched]

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American Heritage
Science Dictionary
kurtosis   (kər-tō'sĭs)  Pronunciation Key 
The general form or a quantity indicative of the general form of a statistical frequency curve near the mean of the distribution.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
There is a kurtosis measure, a fourth moment as standard deviation is a second moment, for this variation.
Kurtosis is a measure of the peakedness of the distribution.
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