contravariant

Etymology

adj

1. (category theory, of a functor) which reverses composition
2. (object-oriented programming) Using or relating to contravariance.
3. (linear algebra, of a vector) Scaling inversely with a change of basis.

noun

1. (algebra) 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.