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Definition of pioneer verb from the Oxford Advanced American Dictionary

 

pioneer

 verb
verb
NAmE//ˌpaɪəˈnɪr//
 
pioneer somethingVerb Forms present simple I / you / we / they pioneer
 
 he / she / it pioneers
 
 past simple pioneered
 
 -ing form pioneering
 
 
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when someone pioneers something, they are one of the first people to do, discover, or use something new a new technique pioneered by surgeons in a Chicago hospital
See pioneer in the Oxford Advanced Learner's Dictionary
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