describes: two waves sufficiently unrelated that knowing the phase of one at some particular time and position does not enable the phase of the other to be predicted at some other position (if spatially incoherent) or time (if temporally incoherent). Usually the phase difference between incoherent waves varies rapidly and randomly. [P6.1]
may also be applied: in its temporal sense, to two oscillations. [P5.3]
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