root mean square

noun Mathematics.
the square root of the arithmetic mean of the squares of the numbers in a given set of numbers. Abbreviation: rms

1890–95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
root mean square
rms the square root of the average of the squares of a set of numbers or quantities: the root mean square of 1, 2, and 4 is √[(1² + 2² + 4²)/3] = √7

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The root mean square error of approximation values was robust in the presence of kurtosis for the elliptical estimation methods.
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