string quartet
US /ˈstrɪŋ kwɔːrˈtet/
UK /ˈstrɪŋ kwɔːrˈtet/

1.
a musical ensemble consisting of two violins, viola, and cello
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The string quartet performed a beautiful classical piece.
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She dreams of playing in a professional string quartet.
2.
a musical composition written for such an ensemble
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Beethoven's late string quartets are considered masterpieces.
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She composed a new string quartet for the festival.