Definitions for mean deviation
Random House Webster's College Dictionary
Statistics.a measure of dispersion, computed by taking the arithmetic mean of the absolute values of the deviations of the functional values from some central value, usu. the mean or median.
Ref: Also called average deviation.
Origin of mean deviation:
mean deviation, mean deviation from the mean(noun)
the arithmetic mean of the absolute values of deviations from the mean of a distribution
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