# 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.

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## Nearby words

## Origin of mean deviation

First recorded in 1890–95

Also called average deviation.

## Definition for average deviation (2 of 2)

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## British Dictionary definitions for average deviation (1 of 2)

## British Dictionary definitions for average deviation (2 of 2)

## 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

## Science definitions for average deviation

## 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.