fluency

1. The quality of smoothness of flow. (countable, uncountable)
2. The quality of being fluent in a language; a person's command of a particular language. (countable, uncountable)
3. The quality of consistently applying skill correctly in the manner of one well-practiced at it, requiring little deliberate thought to perform without mistakes (countable, uncountable)
4. The inherent ability to use a language easily and accurately. (countable, uncountable)

الجمع fluencies