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Definition instrumental in British English

instrumental adjective

adjective
/ˌɪnstrʊˈment(ə)l/
1

involved in an important way in making something happen

Example

an instrumental figure in the governor's campaign for re-election

Example

The general was instrumental in helping both sides to reach a compromise.

Synonyms and related words
2

instrumental music is played by instruments only rather than being sung

Synonyms and related words
Definition instrumental in British English