nonlinear : Idioms & Phrases
nonlinear correlation
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noun any correlation in which the rates of change of the variables is not constant
curvilinear correlation; skew correlation.
WordNet
nonlinear distortion
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noun distortion that occurs when the output signal does not have a linear relation to the input signal
amplitude distortion.
WordNet
nonlinear system
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noun a system whose performance cannot be described by equations of the first degree