"fluency" in the noun sense
1. eloquence, fluency, smoothness
powerful and effective language
"his eloquence attracted a large congregation"
"fluency in spoken and written English is essential"
"his oily smoothness concealed his guilt from the police"
skillfulness in speaking or writing
3. fluency, volubility, articulateness
the quality of being facile in speech and writing
Source: WordNet® (An amazing lexical database of English)
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