nonlinear

Not in a straight line.

Occurring as a result of an operation that is not linear.

Containing a variable with an exponent other than one. Used of an equation.

Of or relating to a system of equations whose effects are not proportional to their causes. Such a set of equations can be chaotic.

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.

Of or relating to the output of such a device.

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

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.