## amplitude- (MATHEMATICS) 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.
• MATHEMATICAL TERMINOLOGY - (PHYSICS) 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. The amplitude
of a pendulum is half the extent of
its swing. Amplitude modulation
(AM) is a common method of encoding a carrier
wave in radio.
• WAVES AND WAVE PHENOMENA • ACOUSTICS AND MUSIC - (ASTRONOMY) 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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