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:
1890–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Root mean square is always a great word to know.

So is proportional. Does it mean:

two quantities having the same or a constant ratio or relation

a number that is a submultiple of all the numbers of a given set

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Collins

World English Dictionary

root mean square

—n
	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
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