physical quantity; (of a periodic variable) measure of its change over a single period (such as time or spatial period)

The amplitude or peak amplitude of a wave is a measure of how big its oscillation is.

In this picture, y is the amplitude of the wave
Different kinds of amplitudes

Amplitudes are always measured as positive numbers (for example: 3.5, 1, 120) and are never negative (for example: -3.5, -1, -120). That's because distance can only be greater than zero or equal to zero; negative distance does not exist.

The distance from the top of one peak to the bottom of another is called peak-to-peak amplitude. Another way to describe peak-to-peak amplitude is to say that it is the distance between the maximum positive value and the maximum negative value of a wave is the maximum displacement of a wave from an equilibrium position

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