covariation

As nouns the difference between covariation and covariant

is that covariation is covariance while covariant is a bihomogeneous polynomial in x'', ''y'', and the coefficients of some homogeneous form in ''x'', ''y , that is invariant under some group of linear transformations.

As an adjective covariant is

(category theory) (of a functor) which preserves composition.

As nouns the difference between terms and covariation

is that terms is while covariation is covariance.

As nouns the difference between covariance and covariation

is that covariance is a statistical measure defined as $\backslash scriptstyle\backslash operatorname\{Cov\}(X,\; Y)\; =\; \backslash operatorname\{E\}((X\; -\; \backslash mu)\; (Y\; -\; \backslash nu))$ given two real-valued random variables X and Y, with expected values $\backslash scriptstyle\; E(X)\backslash ,=\backslash ,\backslash mu$ and $\backslash scriptstyle\; E(Y)\backslash ,=\backslash ,\backslash nu$ while covariation is covariance.