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English definition of “instrument”

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noun [C]  /ˈɪn·strə·mənt/ us  

instrument noun [C] (MUSIC)

an object, such as a piano, guitar, or flute , which is played to produce musical sounds: He plays saxophone, trumpet, and several other instruments.

instrument noun [C] (TOOL)

a tool or other device used for doing a particular piece of work: surgical instruments
(Definition of instrument from the Cambridge Academic Content Dictionary © Cambridge University Press)
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