AAC

American Athletic Conference.

Advanced Audio Coding: a set of standards and a file format for the encoding and compression of digital audio data, or a file compressed in this format: designed to achieve higher sound quality than MP3. Compare MPEG ( def ).MP3 ( def ).

augmentative and alternative communication: the clinical practice or study of systems of communication for people with significant speech difficulties or other communication disorders, usually using symbols and often assistive devices.