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proficiency

[pruh-fish-uh n-see] /prəˈfɪʃ ən si/
noun
1.
the state of being proficient; skill; expertness:
proficiency in music.
Origin
1535-1545
1535-45; < Latin prōfici(ēns) proficient + -ency
Related forms
overproficiency, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for proficiencies

proficiency

n.

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" (see factitious).

Online Etymology Dictionary, © 2010 Douglas Harper
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