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