/ prəˈfɪʃnt; NAmE / adjective
proficient (in / at sth) | proficient (in / at doing sth) able to do sth well because of training and practice :
She's proficient in several languages.
He's proficient at his job.
I'm a reasonably proficient driver.
► pro·fi·ciency / -nsi; NAmE / noun [ U ] proficiency (in sth / in doing sth) :
to develop proficiency
a high level of oral proficiency in English
a certificate of language proficiency
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WORD ORIGIN
late 16th cent.: from Latin proficient- advancing, from the verb proficere , from pro- on behalf of + facere do, make.