The Collaborative International Dictionary of English v.0.48:

Succulence \Suc"cu*lence\, Succulency \Suc"cu*len*cy\, n. [See
   Succulent.]
   The quality or condition of being succulent; juiciness; as,
   the succulence of a peach.
   [1913 Webster]

WordNet (r) 3.0 (2006):

succulency
    n 1: a juicy appetizingness [syn: succulence, succulency,
         juiciness]