proficient
C1Substantiv/US /prɑfˈɪʃənt/ präf-ĬSH-ənt; UK /prɑfˈɪʃənt/ präf-ĬSH-ənt/
One who has made considerable advances in any business, art, science, or branch of learning; an expert; an adept; as, proficient in a trade; a proficient in mathematics, music, etc.
