The Collaborative International Dictionary of English v.0.48:

Jocundity \Jo*cun"di*ty\, n. [L. jocunditas jucunditas. See
   Jocund, and cf. Jucundity.]
   The state or quality of being jocund; gayety; sportiveness.
   [1913 Webster]

WordNet (r) 3.0 (2006):

jocundity
    n 1: a feeling facetious merriment [syn: jocundity,
         jocularity]