The Collaborative International Dictionary of English v.0.48:

Glee \Glee\ (gl[=e]), n. [OE. gle, gleo, AS. gle['o]w, gle['o],
   akin to Icel. gl[=y]: cf. Gr. ? joke, jest.]
   [1913 Webster]
   1. Music; minstrelsy; entertainment. [Obs.] --Chaucer.
      [1913 Webster]

   2. Joy; merriment; mirth; gayety; paricularly, the mirth
      enjoyed at a feast. --Spenser.
      [1913 Webster]

   3. (Mus.) An unaccompanied part song for three or more solo
      voices. It is not necessarily gleesome.
      [1913 Webster]

WordNet (r) 3.0 (2006):

glee
    n 1: great merriment [syn: hilarity, mirth, mirthfulness,
         glee, gleefulness]
    2: malicious satisfaction [syn: gloat, gloating, glee]

Moby Thesaurus II by Grady Ward, 1.0:

71 Moby Thesaurus words for "glee":
   Schadenfreude, amusement, beatification, beatitude, bewitchment,
   blessedness, bliss, blissfulness, blitheness, cantata, cheer,
   cheerfulness, choral singing, chorus, cloud nine, delectation,
   delight, ecstasy, ecstatics, elation, enchantment, enjoyment,
   exaltation, exhilaration, exuberance, exultation, felicity,
   frivolity, fun, gaiety, gladness, gleefulness, good spirits,
   happiness, heaven, high glee, high spirits, hilariousness,
   hilarity, intoxication, jocularity, jocundity, jolliness, jollity,
   joviality, joy, joyance, joyfulness, joyousness, jubilation,
   laughter, levity, madrigal, madrigaletto, merriment, merriness,
   mirth, mirthfulness, oratorio, overhappiness, overjoyfulness,
   paradise, pleasure, rapture, ravishment, satisfaction,
   seventh heaven, sunshine, transport, unalloyed happiness, unison