covariant

[koh-vair-ee-uhnt]
adjective Mathematics.
(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:
1850–55; co- + variant

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Pretest scores were used as the covariant and the posttest scores as the dependent variable.
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