Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. The state of being nonlinear
 n. A deviation from linearity
Etymologies
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Examples

Perhaps you may want to move at least some of "nonlinearity" earlier into the section.

"nonlinearity" only means "not being/using linear functions", and there is no proposal what should be put there.

The result of a systemnonlinearity can be represented by a simple polynomial, where the “variable” is the function representing the waveform (f (t)).

The three key elements of chaos theory are (1) nonlinearity, (2) system states, and (3) how things are ordered when they emerge from chaos.
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The nonlinearity of time that accompanies dementia is the source of much anguish for caregivers who bemoan, "This is not my dad!"

One way to allow a certain amount of nonlinearity is to add ambiguities in the story.

To review a nonlinear narrative, you have to engage with what it's trying to do, and factor in what effect the nonlinearity has on the story.

I think the way we get nonlinearity out of our fiction, especially in the fantasy/SF world, is with written and imagined fanfic.

That is where things often go wrong, for these problems have a measure of nonlinearity, and conditions used at one time to estimate a future time frame may change considerably.
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In practice, the other comments re: torsional stiffness, handling precision, etc. are relevant, as would be taking into account that most of the “springs” in the system exhibit varying degrees of nonlinearity with respect to rate and damping characteristics.
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