Definition of MP3 in English:

MP3

Syllabification: MP3

noun

1A means of compressing a sound sequence into a very small file, to enable digital storage and transmission.
1.1A file in MP3 format: technicalities aside, ripping your own MP3s is easy [as modifier]: an MP3 file
More example sentences
  • The answer: just turn the whole thing into one MP3.
  • Someone Googled me this morning looking for this very MP3.
  • You won't find videos, MP3s, or other flashy media on the site's bare-bones profile pages.

Origin

1990s: from MPEG + Audio Layer-3.

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