- A lack of a definite phase relationship between two or more waves. Two waves, for instance, are in not phase if their crests and troughs do not meet at the same point at the same time. Also called non-coherence (1).
- Any lack of temporal or phase correlation. Also called non-coherence (1).
- A lack of clarity or intelligibility, as may occur in a voice transmission.
- synonym incoherency
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