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proficiency (n.)

1540s, "advancement, progress" (a sense now obsolete), probably from abstract noun suffix -cy + Latin proficientem (nominative proficiens), present participle of proficere "accomplish, make progress; be useful, do good; have success, profit," from pro "forward" (see pro-) + combining form of facere "to make, do" (from PIE root *dhe- "to set, put"). The main modern sense of "degree of advancement attained in some branch of knowledge, art, science, etc." is from 1630s.

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Definitions of proficiency from WordNet

proficiency (n.)
the quality of having great facility and competence;
proficiency (n.)
skillfulness in the command of fundamentals deriving from practice and familiarity;
practice greatly improves proficiency
Synonyms: technique
From wordnet.princeton.edu