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root mean square

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

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

British Dictionary definitions for root mean square

root mean square

noun
  1. the square root of the average of the squares of a set of numbers or quantitiesthe root mean square of 1, 2, and 4 is √[(1² + 2² + 4²)/3] = √7 Abbreviation: rms
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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