<compression, standard, algorithm, file format> A proposed variant of the MPEG video and audio compression algorithm and file format. MPEG-3 was intended as an extension of MPEG-2 to cater for HDTV but was eventually merged into MPEG-2.
Not to be confused with MP3 - MPEG-1 layer 3.
Try this search on Wikipedia, OneLook, Google
Nearby terms: MPEG-2 LSF « MPEG-2 MC « MPEG-2 Multi Channel Extention « MPEG-3 » MPEG-4 » MPEG-4 AAC Main Profile » MPEG-4 AAC SSR