# contravariance

> English word · Noun

## Definitions
1. The reversal of the order of data types acted upon by an operator.
2. A functor which reverses composition.
3. Of vectors, the property of scaling inversely with a change of basis, as opposed to covariance.

## Etymology
From contra- + variance.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/contravariance