# root mean square

- 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

## root mean square

- 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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