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Entry 1 sense Webster, 1913

covariance

· IPA /koʊˈvæɹ.i.əns/
01 n. a statistical measure of the relationship of two variables, formed by multiplying the difference of each variable from its mean, both varia…
  1. 1.
    a statistical measure of the relationship of two variables, formed by multiplying the difference of each variable from its mean, both variables being measured at the same time, and averaging all such products.