covariance - noun - The expectation or mean value of the variable formed by multiplying the differences obtained by subtracting two given variates from their respective means; the product of the standard deviations of two given variates and the coefficient of correlation between them; a statistical measure of the variance of two random variables that are observed or measured in the same period.
Sheesh! I thought I knew what that meant!
(interesting reading here http://en.wikipedia.org/wiki/Covariance_and_contravariance_%28computer_science%29)
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