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Definition of proficiency - 3 dictionary results

pro⋅fi⋅cien⋅cy

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

Origin:
1535–45; < L prōfici(ēns) proficient + -ency
pro·fi·cien·cy   (prə-fĭsh'ən-sē)   
n.   pl. pro·fi·cien·cies
The state or quality of being proficient; competence.

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.
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