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Definition of proficiency - 3 dictionary results
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pro⋅fi⋅cien⋅cy

  [pruh-fish-uhn-see]
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–noun
the state of being proficient; skill; expertness: proficiency in music.
Origin:
1535–45; < L prōfici(ēns) proficient + -ency
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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pro·fi·cien·cy   (prə-fĭsh'ən-sē)   
n.   pl. pro·fi·cien·cies
The state or quality of being proficient; competence.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

proficiency 
1544, probably from L. proficientem (nom. proficiens), prp. of proficere "accomplish, make progress, be useful," from pro- "forward" + root of facere "to make" (see factitious). Proficient (adj.) is recorded from 1590.
Online Etymology Dictionary, © 2001 Douglas Harper
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