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English definition of “proficient”

proficient

adjective uk   /prəˈfɪʃ.ənt/ us  
skilled and experienced: a proficient swimmer She's proficient in two languages. It takes a couple of years of regular driving before you become proficient at it.
proficiency
noun [U] uk   /-ən.si/ us  
The job ad said they wanted proficiency in at least two languages.
(Definition of proficient from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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