The Collaborative International Dictionary of English v.0.48:

jocular \joc"u*lar\ (j[o^]k"[-u]*l[~e]r), a. [L. jocularis, fr.
   joculus, dim. of jocus joke. See Joke.]
   [1913 Webster]
   1. Given to jesting; jocose; as, a jocular person.
      [1913 Webster]

   2. Sportive; merry. "Jocular exploits." --Cowper.
      [1913 Webster]

            The style is partly serious and partly jocular.
                                                  --Dryden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

jocular
    adv 1: with humor; "they tried to deal with this painful subject
           jocularly" [syn: jocosely, jocular]
    adj 1: characterized by jokes and good humor [syn: jesting,
           jocose, jocular, joking]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "jocular":
   Attic, biting, brilliant, buxom, clever, comic, comical, droll,
   facetious, frivolous, funny, gleeful, hilarious, humorous,
   humorsome, jesting, jocose, jocund, joking, joky, jolly, joshing,
   jovial, joyful, joyous, keen, keen-witted, laughable,
   laughter-loving, ludicrous, merry, mirth-loving, mirthful, mordant,
   nimble-witted, playful, pointed, pungent, quick-witted,
   rapier-like, rejoicing, risible, salt, salty, scintillating, sharp,
   smart, sparkling, sportive, sprightly, whimsical, witty