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Description: MP3 in British. abbreviation for. 1. MPEG-1 Audio Layer-3: software that enables files to be compressed quickly to 10% or less of their original size for storage on disk or hard drive or esp for transfer over the internet. MP3 is an audio coding format for digital audio which uses a form of irreversible data compression (original bits cannot be recreated from the compressed bits) . It was designed by Moving Pictures Expert Group (MPEG) as part of its MPEG-1 standard and later extended in the MPEG-2 standard .