The term "amplitude" is used to refer to the magnitude of an oscillation, so the amplitude of the sinusoid

is , where is the absolute value of .

The term "amplitude" is also used to refer to the Jacobi amplitude, or occasionally, to the complex argument.

CITE THIS AS:

Weisstein, Eric W. "Amplitude." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/Amplitude.html