define amplitude

Amplitude is the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. It represents the strength or intensity of the vibration or wave. In a wave, such as a sound wave or electromagnetic wave, it corresponds to the maximum variation in pressure or the maximum displacement from the equilibrium position of the particles in the medium through which the wave is traveling. In simple terms, the amplitude determines the height or magnitude of the wave.