proficiency
pro·fi·ciency
noun
1.
the quality of having great facility and competence
2.
skillfulness in the command of fundamentals deriving from practice and familiarity
- “practice greatly improves proficiency”
Origin
From proficient or its etymon, Latin prōficiēns (present participle of prōficiō), + -ency.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.