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proficient (adj.)

"well-versed in any business, art, science, etc.," 1580s, a back-formation from proficiency or else from Old French proficient (15c.), from Latin proficientem (nominative proficiens), present participle of proficere "to make progress, go forward, effect, accomplish, be useful," from pro "forward" (see pro-) + combining form of facere "to make, do" (from PIE root *dhe- "to set, put"). Related: Proficiently.

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Definitions of proficient from WordNet

proficient (adj.)
having or showing knowledge and skill and aptitude;
a proficient engineer
Synonyms: adept / expert / good / practiced / skillful / skilful
proficient (adj.)
of or relating to technique or proficiency in a practical skill;
Synonyms: technical
From wordnet.princeton.edu