- proficiency (n.)
[proficiency 词源字典]
- 1540s, probably from -cy + Latin proficientem (nominative proficiens), present participle of proficere "accomplish, make progress; be useful, do good; have success, profit," from pro- "forward" (see pro-) + root of facere "to make, do" (see factitious).[proficiency etymology, proficiency origin, 英语词源]