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proficiency

[pruh-fish-uh n-see]
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noun
  1. the state of being proficient; skill; expertness: proficiency in music.
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Origin of proficiency

1535–45; < Latin prōfici(ēns) proficient + -ency
Related formso·ver·pro·fi·cien·cy, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for 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).

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Online Etymology Dictionary, © 2010 Douglas Harper