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English definition of “instrumental”

instrumental

adjective     /ˌɪnstrəˈmentəl/
be instrumental in sth/doing sth to be one of the main people or things that make something happen: Mikan was instrumental in establishing professional basketball in the US.Affecting and influencing
involving only musical instruments, and no singingTypes of music
(Definition of instrumental adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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