Source : Webster's Revised Unabridged Dictionary (1913)

Fluency \Flu"en*cy\, n. [L. fluentia: cf. F. fluence. See
   {Fluent}.]
   The quality of being fluent; smoothness; readiness of
   utterance; volubility.

         The art of expressing with fluency and perspicuity.
                                                  --Macaulay.

Source : WordNet®

fluency
     n 1: powerful and effective language [syn: {eloquence}]
     2: skillfulness in speaking or writing
     3: the quality of being facile in speech and writing [syn: {volubility},
         {articulateness}]