The Collaborative International Dictionary of English v.0.48:

jocularity \joc`u*lar"i*ty\ (j[o^]k`[-u]*l[a^]r"[i^]*t[y^]), n.
   Jesting; merriment.
   [1913 Webster]

WordNet (r) 3.0 (2006):

jocularity
    n 1: a feeling facetious merriment [syn: jocundity,
         jocularity]
    2: fun characterized by humor [syn: jocosity, jocularity]
    3: activity characterized by good humor [syn: jest, joke,
       jocularity]