Source : Webster's Revised Unabridged Dictionary (1913)

Jocosity \Jo*cos"i*ty\, n.
   A jocose act or saying; jocoseness. --Sir T. Browne.

Source : WordNet®

jocosity
     n 1: fun characterized by humor [syn: {jocularity}]
     2: the trait of merry joking [syn: {jocoseness}, {merriness}, {humorousness}]