The Collaborative International Dictionary of English v.0.48:

garrulity \gar*ru"li*ty\, n. [L. garrulitas: cf. F.
   garrulit['e].]
   Talkativeness; loquacity.
   [1913 Webster]

WordNet (r) 3.0 (2006):

garrulity
    n 1: the quality of being wordy and talkative [syn: garrulity,
         garrulousness, loquaciousness, loquacity,
         talkativeness]