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1. An MPEG standard used especially for digitally transmitting music.
2. A file containing a song or other audio data that is encoded using this standard: The band's MP3s can be downloaded from their website.
[From MP(EG-1 layer) 3.]
1. (Computer Science) MPEG-1 Audio Layer-3: tradename for software created by the Motion Picture Experts Group 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 across the internet
2. (Computer Science) an audio or video file created in this way
the file extension for MPEG Audio Layer-3, a set of standards for compressing and downloading audio files from the Internet. Compare MPEG.