The Collaborative International Dictionary of English v.0.48:

Amusement \A*muse"ment\, n. [Cf. F. amusement.]
   1. Deep thought; muse. [Obs.]
      [1913 Webster]

            Here I . . . fell into a strong and deep amusement,
            revolving in my mind, with great perplexity, the
            amazing change of our affairs.        --Fleetwood.
      [1913 Webster]

   2. The state of being amused; pleasurable excitement; that
      which amuses; diversion.
      [1913 Webster]

            His favorite amusements were architecture and
            gardening.                            --Macaulay.
      [1913 Webster]

   Syn: Diversion; entertainment; recreation; relaxation;
        pastime; sport.
        [1913 Webster]

WordNet (r) 3.0 (2006):

amusement
    n 1: a feeling of delight at being entertained
    2: an activity that is diverting and that holds the attention
       [syn: entertainment, amusement]

Moby Thesaurus II by Grady Ward, 1.0:

72 Moby Thesaurus words for "amusement":
   animal pleasure, beguilement, bodily pleasure, carnal delight,
   comfort, content, contentment, coziness, creature comforts,
   dissipation, distraction, diversion, divertissement, ease,
   endpleasure, enjoyment, entertainment, euphoria, forepleasure,
   frivolity, fruition, fun, game, glee, gleefulness, gratification,
   great satisfaction, gusto, hearty enjoyment, high glee,
   hilariousness, hilarity, intellectual pleasure, jocularity,
   jocundity, joie de vivre, joke, jolliness, jollity, joviality, joy,
   joyfulness, joyousness, keen pleasure, kicks, lark, laughter,
   levity, luxury, merriment, merriness, mirth, mirthfulness, pastime,
   physical pleasure, pleasure, quiet pleasure, recreation,
   relaxation, relish, satisfaction, self-gratification,
   self-indulgence, sensual pleasure, sensuous pleasure,
   sexual pleasure, sport, sweetness of life, titillation,
   voluptuousness, well-being, zest