1 Physics the maximum extent of a vibration or oscillation, measured from the position of equilibrium:the amplitude of alpha rhythms [count noun]:waves with amplitudes greater than or equal to 20 mm
the maximum difference of an alternating electric current or potential from the average value:the detection of signals only a few microvolts in amplitude
2 Astronomy the angular distance of a celestial object from the true east or west point of the horizon at rising or setting.
3breadth, range, or magnitude:the amplitude of the crime of manslaughter lies beneath murder
4 Mathematics the angle between the real axis of an Argand diagram and a vector representing a complex number.
