What is the meaning of Contravariant?

Which reverses the order of morphism composition: formally, which associates each morphism to a morphism .

Using or relating to contravariance.

Scaling inversely with a change of basis.

A bihomogeneous polynomial in dual variables of x, y, ... and the coefficients of some homogeneous form in x, y, ... that is invariant under some group of linear transformations.

Source: wiktionary.org