The Collaborative International Dictionary of English v.0.48:
Loquaciousness \Lo*qua"cious*ness\, n. Loquacity. [1913 Webster]WordNet (r) 3.0 (2006):
loquaciousness n 1: the quality of being wordy and talkative [syn: garrulity, garrulousness, loquaciousness, loquacity, talkativeness]