The Collaborative International Dictionary of English v.0.48:

Loquacity \Lo*quac"i*ty\, n. [L. loquacitas: cf. F.
   loquacit['e].]
   The habit or practice of talking continually or excessively;
   inclination to talk too much; talkativeness; garrulity.
   [1913 Webster]

         Too great loquacity and too great taciturnity by fits.
                                                  --Arbuthnot.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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

The Devil's Dictionary (1881-1906):

LOQUACITY, n.  A disorder which renders the sufferer unable to curb
his tongue when you wish to talk.