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  • Acoustics:
  1. Any change in the waveform or harmonic content of an original signal as it passes through a device. The result of nonlinearity within the device.
  2. Anything that alters the musical signal. There are many forms of distortion, some of which are more audible than others. Source: http://www.owenscorning.com/around/sound/glossary.asp
  • Electronics: An unwanted modification of a desired signal.