1. The hearing of the same sound differently by one ear than by the other one so that a single sound is perceived as two: As a musician, Jasper realized that the displacusis from which he suffered was getting progressively worse and he realized that he would need to change careers if his condition could not be cured.

Iris thought she was losing her mind when she first developed diplasusis, because she was concerned that she was hearing duplicate sounds when she was sure she only should have heard just one.

2. Etymology: from Greek dipl-, "two fold, double" + akousis, "hearing".