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A condition of the hearing.

Greek akoustikos, from akouein, to hear.

The most common example here is hyperacusis (Greek huper, over, beyond), abnormally acute hearing or painful sensitivity to sounds. Others are paracusis (Greek para, amiss or irregular), a general term for an abnormality of hearing; hypoacusis (Greek hupo, under), a reduced sensitivity to sounds; and diplacusis (Greek diplous, double), a defect of the inner ear so that one sound is heard as two.

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