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arithmetic mean the sum of a series of quantities divided by the number of quantities; average.
golden mean the prudent, moderate course between extremes; happy medium. [2 definitions]
mean business to intend definite and serious action.
mean deviation a measure of variability, esp. in a statistical distribution, that is equal to the average of the absolute values of a set of deviations from the arithmetic mean or some other specified value.
mean distance the arithmetic average of the greatest and least distances of a planet from the sun, used to describe the size of the planet's orbit.
root mean square the square root of the arithmetic mean of the squares in a given set of numbers.