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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
Dictionary entries near proficient
professor
professorial
professorship
proffer
proficiency
proficient
profile
profiling
profit
profitability
profitable