- (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
- (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.
AND WAVE PHENOMENA
- (ASTRONOMY) The difference between
the maximum and minimum magnitudes of a variable
star, i.e., the total range of its brightness.