proficiency

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

Origin:
1535–45; < Latin prōfici(ēns) proficient + -ency

overproficiency, noun
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World English Dictionary
proficient (prəˈfɪʃənt)
 
adj
1.  having great facility (in an art, occupation, etc); skilled
 
n
2.  an archaic word for an expert
 
[C16: from Latin prōficere to make progress, from pro-1 + facere to make]
 
pro'ficiency
 
n
 
pro'ficiently
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

proficiency
1540s, probably from L. proficientem (nom. proficiens), prp. of proficere "accomplish, make progress, be useful," from pro- "forward" + root of facere "to make" (see factitious).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Geographic knowledge increases through travel and language proficiency, among
  other factors.
Our sharpshooters have taken firearms safety courses and regularly qualify with
  the weapon proficiency.
Artists tended to aim for a popular audience with as much technical proficiency
  as possible.
He still retains a pretty high level of mechanical and technical proficiency.
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