mp3

mp3 is the alternative letter-case form of MP3.

Noun capitalized: MP3

MP3 (plural MP3s)

A digital sound recording in MP3 format; a song file.
- I should download her audio on MP3 / And show the whole world how you gave Eminem VD2000, “The Real Slim Shady”, in The Marshall Mathers LP, performed by Eminem

MP3

(audio file format) MPEG-1 Audio Layer 3, an audio data compression format.
- Also, mpeg audio streams are usually identified by mp1, mp2 and mp3 extensions, all from MPEG-1 (layer 1 , 2 or 3).1994 November 6, Francois Dion, “Does anyone know of .mpa to .wav conversion software.”, in comp.multimedia (Usenet)
- A smartphone is not the best camera, notebook, word processor, audio recorder, radio, MP3 player, map reader, pedometer and so on, but it is good enough replace numerous separate devices for most people most of the time.2019 June 27, Jack Schofield, “What’s the best cheap tablet or e-reader for PDF files?”, in The Guardian, archived from the original on 05 Apr 2023

plural	mp3s
plural	MP3s

Initialism of MPEG Audio Layer 3. First use appears c. 1994. See cite below.

What does mp3 mean?: Mp3 means a digital sound recording in MP3 format; a song file.
What is mp3 the alternative letter-case form of?: Mp3 is the alternative letter-case form of MP3.
What part of speech is mp3?: Mp3 can be a noun or a proper noun.
What is the plural of mp3?: The plural of mp3 is mp3s.

Adapted from Wiktionary: mp3 (page history and authors); MP3 (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated: 2026-09-02

Cite this entry: “mp3.” Word.ws, https://word.ws/mp3. Based on Wiktionary, CC BY-SA 4.0.