# quadratic mean

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## English

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### Etymology

Quadratic in the phrase refers to the squaring on the terms.

### Noun

quadratic mean (plural quadratic means)

1. (mathematics) A type of average, calculated as the square root of the mean of the squares, ie. ${\displaystyle Q={\sqrt {x_{1}^{2}+x_{2}^{2}+...+x_{n}^{2} \over n}}}$.