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looks big because is taking space

:-)

Seriously, it's the height of the turning-point above or below the x-axis; applied normally to the maxima or minima of a harmonic curve such as a sine-wave, typically measured as an electrical or acoustic signal.

If both turning-point heights are added the total amplitude is called "Peak-to-Peak"; if only one side is used, it's the "Peak" amplitude. There's also an intermediate "Root Mean Square" (r.m.s.) level, a sort of algebraic average, but I don't know its formula to quote here.

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13y ago

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