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