WordReference Random House Unabridged Dictionary of American English © 2020
MP3,1 
  1. Computingthe file extension for MPEG Audio Layer-3, a set of standards for compressing and downloading audio files from the Internet. Cf.  MPEG 
  • 1990–95

Collins Concise English Dictionary © HarperCollins Publishers::
MP3 abbreviation for
  1. 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. an audio or video file created in this way
'mp3' also found in these entries:
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