amplitude
- (phys.) The maximum departure of a cyclical quantity from its mean value, i.e. the maximum height of a wave peak or the maximum depth of a wave trough.
WAVES AND WAVE PHENOMENA
ACOUSTICS AND MUSIC
- (math.) Size or magnitude. The origin of the word is the same Indo-European ple root that gives us “plus” and “complement.” The more immediate Latin source is amplus for wide. Today, “amplitude” is used to describe, among other things, the distance a periodic function varies from its central value, and the magnitude of a complex number.
MATHEMATICS
(astron.) The difference between the maximum and minimum magnitudes of a variable star, i.e. the total range of its brightness.
ASTRONOMICAL QUANTITIES
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