TIA's Glossary of Telecommunication Terms
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phase distortion
Distortion that occurs when (a) the phase-frequency characteristic is not linear over the frequency range of interest, i.e. , the phase shift introduced by a circuit or device is not directly proportional to frequency, or (b) the zero-frequency intercept of the phase-frequency characteristic is not 0 or an integral multiple of 2
radians. (188) Synonym phase-frequency distortion.