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mean deviation

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noun Statistics.
  1. 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.
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Origin of mean deviation

First recorded in 1890–95
Also called average deviation.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for mean deviation

mean deviation

noun statistics
  1. the difference between an observed value of a variable and its mean
  2. 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
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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

mean deviation in Science

mean deviation

  1. In a statistical distribution, the average of the absolute values of the differences between individual numbers and their mean.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.