Usually means: Variance where types reverse direction.
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We found 3 dictionaries that define the word contravariance:

General (3 matching dictionaries)
  1. Contravariance: Wordnik
  2. contravariance: Wiktionary
  3. Contravariance (computer science), Contravariance: Wikipedia, the Free Encyclopedia

Definitions from Wiktionary (contravariance)

noun:  (object-oriented programming) The reversal of the order of data types acted upon by an operator.
noun:  (category theory) A functor which reverses composition.
noun:  (linear algebra) Of vectors, the property of scaling inversely with a change of basis, as opposed to covariance.

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