noun Statistics.
asymmetry in a frequency distribution.
a measure of such asymmetry.

1890–95; skew + -ness Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
skewness (ˈskjuːnɪs)
1.  the quality or condition of being skew
2.  statistics See kurtosis a measure of the symmetry of a distribution around its mean, esp the statistic B1 = m3/(m2)3/2, where m2 and m3 are respectively the second and third moments of the distribution around the mean. In a normal distribution, B1 = 0

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Example sentences
Over the past thirty-five years, and especially over the past ten, that top-end
  skewness has greatly increased.
We test this conjecture by examining the skewness of market returns.
As the absolute value of g increases, the amount of the skewness increases.
The skewness statistic, on the other hand, appears to have a large product- or
  industry-specific component.
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