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What does contravariant mean?

Looking for the meaning or definition of the word contravariant? Here's what it means.

Adjective
  1. (category theory, of a functor) which reverses composition
  2. (object-oriented programming) Using or relating to contravariance.
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.
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