fluency in WordNet English dictionary

1. the quality of being facile in speech and writing
   fluency  volubility  articulateness 
   
2. 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"
   eloquence  fluency  smoothness 
   
3. skillfulness in speaking or writing
   fluency