nonlinearity

[non-lin-ee-ar-i-tee]
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noun

Mathematics. the quality of a function that expresses a relationship that is not one of direct proportion.
Electricity. deviation of an input-output relationship from one of direct proportionality.

Origin of nonlinearity

First recorded in 1925–30; non- + linearity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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