The absolute value of the maximum displacement from a zero value during one period of an oscillation The maximum deviation of an alternating current from its average value during its cycle
The maximum value of the electromagnetic wave, measured from the mean to the extreme; put simply, the height of the wave (See drawing under POLARIZATION )
The magnitude of the displacement of a wave from a mean value For a simple harmonic wave, it is the maximum displacement from the mean For more complex wave motion, amplitude is usually taken as one-half of the mean distance (or difference) between maxima and minima
the strength or "loudness" of the seismic signal at any time The amplitude of a reflection event is taken to be proportional to the reflection coefficient at the boundary, although the seismic wavelet and tuning phenomenon may corrupt this relationship Since reflection coefficients can be negative or positive, seismologists speak of both negative and positive amplitudes
the height, or degree of execution of a movement In general, the higher the salto or the more breathtaking the movement, the better the amplitude and the score
The amount of a signal Amplitude is measured by determining the amount of fluctuation in air pressure (of a sound), voltage (of an electrical signal), or numerical data (in a digital application) When the signal is in the audio range, amplitude is perceived as loudness
In physics, the amplitude of a sound wave or electrical signal is its strength. the distance between the middle and the top or bottom of a wave such as a sound wave (amplitudo, from amplus; AMPLE)