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Postlingually Deafened – Individual who becomes deaf after having acquired language.

Prelingually Deafened – Persons either born deaf or who lost his or her hearing early in childhood, before acquiring language.

Presbycusis – Loss of hearing that gradually occurs because of changes in the inner or middle ear in individuals as they grow older the type of hearing loss often associated with presbycusis is a sensorineural hearing loss. Learn more about aging and hearing loss.

Profound hearing loss – A hearing loss ranging between 91 and 120 dB. This is essentially a total hearing loss.

Pure Tone Audiometry – Refers to the part of a complete hearing evaluation that includes the measuring of air–conduction and bone–conduction thresholds while using non–complex (pure) tones.