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English definition of “instrument”

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instrument

noun [C] uk   /ˈɪn.strə.mənt/ us  

instrument noun [C] (MUSIC)

A2 ( also musical instrument) an object, such as a piano, guitar, or drum, that is played to produce musical sounds: Which instrument do you play?
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instrument noun [C] (TOOL)

C1 a tool or other device, especially one without electrical power, used for performing a particular piece of work: surgical instruments instruments of torture The man's injuries had obviously been caused by a blunt instrument. a device used for measuring speed, height, etc. in vehicles, especially aircraft: the instrument panel The lightning had damaged the plane's instruments, and they weren't giving any readings.C2 formal a way of achieving or causing something: He saw the theatre as an instrument of change - a way of forcing people to consider social and political issues.
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instrument noun [C] (FINANCE)

a type of investment in a company or in government debt that can be traded on the financial markets: They trade in the debt instruments of developing countries. increasingly complex financial instruments
(Definition of instrument from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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