# 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

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## Origin of root mean square

First recorded in 1890–95

## Words nearby root mean square

rootkit, root knot, rootle, rootless, rootlet, root mean square, root nodule, root of lung, root of nail, root of penis, root of the matter

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## British Dictionary definitions for root mean square

root mean square

### noun

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

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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