Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Not in a straight line.
  • adjective Occurring as a result of an operation that is not linear.
  • adjective Containing a variable with an exponent other than one. Used of an equation.
  • adjective Of or relating to a system of equations whose effects are not proportional to their causes. Such a set of equations can be chaotic.
  • adjective Of or relating to a device whose behavior is described by a set of nonlinear equations and whose output is not proportional to its input.
  • adjective Of or relating to the output of such a device.

from The Century Dictionary.

  • Not linear; in mathematics, not of the first degree.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective (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.
  • adjective (Math.) Containing variables of greater than the first degree; -- of an equation. Opposite of linear.
  • adjective (Physics) Represented by equations containing variables of greater than the first degree; -- of physical processes or relationships. Opposite of linear.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective of a set of points not lying on a straight line
  • adjective chemistry, of a molecule whose atoms do not lie in a straight line
  • adjective mathematics, of a function having a product of independent variables, or a variable with an exponent not equal to one
  • adjective of a system whose output is not directly proportional to its input
  • adjective erratic and unpredictable; tending to jump back and forth

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective designating or involving an equation whose terms are not of the first degree

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

non- +‎ linear

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Examples

  • I am quite familiar with the standard scientific application of ˜irreducible complexity 'in nonlinear science.

    A decent, popular article on intelligent design 2005

  • I am quite familiar with the standard scientific application of 'irreducible complexity' in nonlinear science.

    A decent, popular article on intelligent design 2005

  • My research in nonlinear optics continued with special emphasis on interactions of picosecond and femtosecond laser pulses with condensed matter and of collision-induced optical coherences.

    Nicolaas Bloembergen - Autobiography 1981

  • Digital-power mavens also brag about "nonlinear" - control approaches, but these loops prevent you from connecting a network analyzer on digital-power chips.

    Engineering Hardware-Software 2010

  • Digital-power mavens also brag about "nonlinear" - control approaches, but these loops prevent you from connecting a network analyzer on digital-power chips.

    Engineering Hardware-Software 2010

  • A further analysis, where G. Nicolis played a key role, showed that an unexpected phenomenon appeared while one considered the fluctuation problem in nonlinear systems far from equilibrium: the distribution law of fluctuations depends on their scale, and only "small fluctuations" follow the law proposed by Einstein. 29 After a prudent reception, this result is now widely accepted, and the theory of non-equilibrium fluctuations is fully developing now, so as to allow us to expect important results in the following years.

    Ilya Prigogine - Autobiography 1977

  • The U.S. tax code is highly complex (what mathematicians would call nonlinear and discontinuous) and small differences in your circumstances can make a big difference in determining whether converting is for you.

    The Do-It-Yourself Roth Conversion Calculator 2010

  • The U.S. tax code is highly complex (what mathematicians would call nonlinear and discontinuous) and small differences in your circumstances can make a big difference in determining whether converting is for you.

    The Do-It-Yourself Roth Conversion Calculator Daniel Royer 2010

  • There have been hundreds of manpower hours and computer resources spent on the so called nonlinear normal mode initialization NNMI procedure.

    Exponential Growth in Physical Systems #2 « Climate Audit 2007

  • So the company uses a so-called nonlinear, or "frequency doubling," crystal.

    Lasers Project the Big Picture 2006

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