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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.
Origin of root mean square
First recorded in 1890-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for root mean square

root mean square

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, rms
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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