Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An MPEG standard used especially for digitally transmitting music over the Internet.
  • n. A file containing a song or other audio data that is encoded using this standard: The band released its latest single as an MP3 on the Internet.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A digital sound recording; a song file.
  • MPEG-1 Audio Layer 3, an audio data compression format.

Etymologies

From MP(EG-1 layer) 3.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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