American English

Definition of influential adjective from the Oxford Advanced American Dictionary

 

influential

 adjective
adjective
NAmE//ˌɪnfluˈɛnʃl//
 
 
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having a lot of influence on someone or something a highly influential book influential in something She is one of the most influential figures in local politics. influential in doing something The committee was influential in formulating government policy on employment.
See the Oxford Advanced Learner's Dictionary entry: influential