covariant

[koh-vair-ee-uh nt]
adjective Mathematics.
  1. (of one magnitude with respect to another) varying in accordance with a fixed mathematical relationship: The area of a square is covariant with the length of a side.

Origin of covariant

First recorded in 1850–55; co- + variant
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of covariant