The Collaborative International Dictionary of English v.0.48:
Sesquipedality \Ses`qui*pe*dal"i*ty\, n. 1. The quality or condition of being sesquipedal. --Sterne. [1913 Webster] 2. The use of sesquipedalian words; style characterized by the use of long words; sesquipedalism. [1913 Webster]WordNet (r) 3.0 (2006):
sesquipedality n 1: using long words