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From The Collaborative International Dictionary of English v.0.48:
nonlinear \nonlinear\ adj. 1. (Math.) Not depictable graphically as a straight line; not changing by a constant amount for each unit of time, distance, or other independent variable. Opposite of linear. [WordNet 1.5 +PJC] 2. (Math.) Containing variables of greater than the first degree; -- of an equation. Opposite of linear. [PJC] 3. (Physics) Represented by equations containing variables of greater than the first degree; -- of physical processes or relationships. Opposite of linear. [PJC]