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English definition of “proficient”

proficient

adjective  /prəˈfɪʃ·ənt/ us  
skilled and experienced: a proficient swimmer He studied Chinese and became proficient in the language.
proficiency
noun [U]  /prəˈfɪʃ·ən·si/ us  
Morgan has great proficiency as a jazz saxophonist.
(Definition of proficient from the Cambridge Academic Content Dictionary © Cambridge University Press)
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