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MP3

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MP3/ˌɛmˌpiːˈθriː/noun
pluralMP3s
MP3
/ˌɛmˌpiːˈθriː/
noun
pluralMP3s
Learner's definition of MP3  
[noncount]  : a computer format for creating sound files (such as songs) that are much smaller than standard sound files — often used before another noun
[count]  : a computer file (such as a song) in the MP3 format
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