Definition of proficient adjective from the Oxford Advanced Learner's Dictionary

 

proficient

 adjective
adjective
BrE BrE//prəˈfɪʃnt//
 
; NAmE NAmE//prəˈfɪʃnt//
 
 
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able to do something well because of training and practice I'm a reasonably proficient driver. With practice, you should become proficient within six months. proficient in something/in doing something She's proficient in several languages. proficient at something/at doing something He's proficient at his job. Word Origin late 16th cent.: from Latin proficient- ‘advancing’, from the verb proficere, from pro- ‘on behalf of’ + facere ‘do, make’.Extra examples a technically proficient performance of the piece very proficient at sign language He’s proficient at his job. I’m a reasonably proficient driver. She’s proficient in several languages.
See the Oxford Advanced American Dictionary entry: proficient

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