| standard deviation n. Abbr. SD A statistic used as a measure of the dispersion or variation in a distribution, equal to the square root of the arithmetic mean of the squares of the deviations from the arithmetic mean. |
standard deviation (st n d rd) A statistic used as a measure of the dispersion or variation in a distribution, equal to the square root of the arithmetic mean of the squares of the deviations from the arithmetic mean. |
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| Noun | 1. | standard deviation - the square root of the variance statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters variance - the second moment around the mean; the expected value of the square of the deviations of a random variable from its mean value |
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