nonlinearity

[non-lin-ee-ar-i-tee]
noun
1.
Mathematics. the quality of a function that expresses a relationship that is not one of direct proportion.
2.
Electricity. deviation of an input-output relationship from one of direct proportionality.

Origin:
1925–30; non- + linearity

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Identifying a nonlinearity parameter applicable for guided surface acoustic waves is of current interest to our group.
Nonlinearity is essentially linked to the stress-strain relation.
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