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mean deviation

noun, 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, usually the mean or median.
Also called average deviation.
Origin of mean deviation
First recorded in 1890-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for average deviation

average deviation

(statistics) another name for mean deviation

mean deviation

noun (statistics)
the difference between an observed value of a variable and its mean
Also mean deviation from the mean, mean deviation from the median, average deviation. a measure of dispersion derived by computing the mean of the absolute values of the differences between observed values of a variable and the variable's mean
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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average deviation in Science
mean deviation  
In a statistical distribution, the average of the absolute values of the differences between individual numbers and their mean.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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