MP3
noun
ˌem-(ˌ)pē-ˈthrē 
1
: a computer file format for the compression and storage of digital audio data
2
: a computer file (as of a song) in the MP3 format
Example Sentences
downloading MP3s off the Internet
Word History
Etymology
from the file extension .mp3 used for such files, short for MPEG Audio Layer 3
First Known Use
1994, in the meaning defined at sense 1
Kids Definition
MP3
noun
ˌem-ˌpē-ˈthrē
1
: a computer format for creating sound files (as songs) that are much smaller than standard sound files
2
: a computer file (such as a song) in the MP3 format