The Collaborative International Dictionary of English v.0.48:

Corpulence \Cor"pu*lence\ (k?r"p?-lens), Corpulency
\Cor"pu*len*cy\ (k?r"p?-len-s?), n. [L. corpulentia: cf. F.
   corpulence.]
   [1913 Webster]
   1. Excessive fatness; fleshiness; obesity.
      [1913 Webster]

   2. Thickness; density; compactness. [Obs.]
      [1913 Webster]

            The heaviness and corpulency of water requiring a
            great force to divide it.             --Ray.
      [1913 Webster]

WordNet (r) 3.0 (2006):

corpulency
    n 1: more than average fatness [syn: fleshiness, obesity,
         corpulency]