Source : Webster's Revised Unabridged Dictionary (1913)

Jocose \Jo*cose"\, a. [L jocosus, fr. jocus joke. See {Joke}.]
   Given to jokes and jesting; containing a joke, or abounding
   in jokes; merry; sportive; humorous.

         To quit their austerity and be jocose and pleasant with
         an adversary.                            --Shaftesbury.

         All . . . jocose or comical airs should be excluded.
                                                  --I. Watts.

   Syn: Jocular; facetious; witty; merry; pleasant; waggish;
        sportive; funny; comical. -- {Jo*cose"ly}, adv. --
        {Jo*cose"ness}, n.

              Spondanus imagines that Ulysses may possibly speak
              jocosely, but in truth Ulysses never behaves with
              levity.                             --Broome.

              He must beware lest his letter should contain
              anything like jocoseness; since jesting is
              incompatible with a holy and serious life.
                                                  --Buckle.

Source : WordNet®

jocoseness
     n : the trait of merry joking [syn: {jocosity}, {merriness}, {humorousness}]