Amplitude refers to the Magnitude or intensity of a sound wave, determining the loudness of the sound; in vision the amplitude of a light wave affects the brightness of a stimulus which is measured in decibels
Other /More definition:
Amplitude refers to the range of muscle fiber length between maximal and minimal lengthening; the "size" or "height" of a tremor; the extend or breadth of a tremor's range. Amplitude also refers to the intensity of a sound or other stimulus

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