contravariant

1. not comparablecategory theoryWhich reverses the order of morphism composition: formally, which associates each morphism f:X→Y to a morphism F(f):F(Y)→F(X).

   Antonyms: covariant

2. not comparableobject-oriented programmingUsing or relating to contravariance.
3. not comparablelinear algebraScaling inversely with a change of basis.

plural contravariants

1. algebraA 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.