The Collaborative International Dictionary of English v.0.48:

Divertissement \Di`ver`tisse`ment"\, n. [F.]
   A short ballet, or other entertainment, between the acts of a
   play. --Smart.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "divertissement":
   act, afterpiece, amusement, bit, capriccio, caprice, chaser,
   curtain, curtain call, curtain raiser, dissipation, distraction,
   diversion, divertimento, divertisement, enjoyment, entertainment,
   epilogue, exode, exodus, expository scene, fantasia, finale,
   hoke act, humoresque, interlude, intermezzo, intermission,
   introduction, medley, mirth, number, passe-temps, pastime,
   pleasure, potpourri, prologue, recreation, regalement, relaxation,
   romance, romanza, routine, scene, shtick, sketch, skit, solace,
   song and dance, stand-up comedy act, striptease, turn