Hm...I'd need to know if you're speaking in terms of algebraic functions (like the difference between a "linear" function and a "quadratic" function), or trying to apply 2-dimensional definitions of "line" to 3-dimensional geometry (like...the equator on the globe is a line [also known as a "great circle"], but it doesn't follow the definition of a 2 dimensional line.
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Linear means anything that forms a straight line. Nonlinear means the opposite. Something that doesn't form a straight line.
A linear function would be represented by a straight line graph, so if it's not a straight line, it's nonlinear
Nonlinear.
a graph that does not have a straight line...
A scale that is nonlinear. ~