The loudness of a sound. Measured in decibels (dB).

The third (innermost) section of the ear where sound vibrations and balance signals are transformed into nerve impulses. The inner ear contains the cochlea (organ of hearing) and the labyrinth or vestibular system (the organ of balance).

A kind of assistive listening device that transmits amplified sound by light waves to a receiver, thus eliminating background noise and distance problems.

A change in the pitch of the speaking voice to add meaning or emphasis to a word or phrase.

See Audio Induction Loop.

The individuals with disabilities in education Act PL94-142, revised.