PLENILOQUENCE By Nugent, Pam M.S. - April 7, 2013 noun. a compulsion to speak incessantly. PLENILOQUENCE: "Her pleniloquence is immediately noticeable and quite bothersome." Related Psychology Terms ERGOMANIA DELIRE DU TOUCHER CACOETHES POLYPHAGIA CONTRASUGGESTIBILITY EROTOGRAPHOMANIA BRONCHUS SYMMETRY COMPULSION CACOETHES BRONCHUS Cite this page: Nugent, Pam M.S., "PLENILOQUENCE," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/pleniloquence/ (accessed September 24, 2018).