n.1 a Physics the maximum extent of a vibration or oscillation from the position of equilibrium. b Electr. the maximum departure of the value of an alternating current or wave from the average value.
2 a spaciousness, breadth; wide range. b abundance.
Phrases and idioms:
amplitude modulation Electr.
1. the modulation of a wave by variation of its amplitude.
2 the system using such modulation.
Etymology: F amplitude or L amplitudo (as AMPLE)