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English definition of “instrumental”

instrumental

adjective uk   /ˌɪn.strəˈmen.təl/ us    /-t̬əl/

instrumental adjective (INFLUENCE)

[after verb] formal If someone or something is instrumental in a process, plan, or system, that person or thing is one of the most important influences in causing it to happen: She was instrumental in bringing about the prison reform act.

instrumental adjective (MUSIC)

involving only musical instruments, and no singing: instrumental music an instrumental piece/arrangement

instrumental

noun [C] uk   /ˌɪn.strəˈmen.təl/ us    /-t̬əl/
a piece of music without singing
(Definition of instrumental from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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