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]