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English definition of “instrumental”

instrumental

adjective [after verb] (INFLUENCE)    /ˌɪn.strəˈmen.təl/ US  /-t̬əl/ formal
If someone or something is instrumental in a process, plan, or system, they are one of the most important influences in causing it to happen: She was instrumental in bringing about the prison reform act.Affecting and influencing
(Definition of instrumental adjective (INFLUENCE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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