The Collaborative International Dictionary of English v.0.48:

Disenchantment \Dis`en*chant"ment\, n. [Pref. dis- +
   enchantment: cf. F. d['e]senchantement.]
   The act of disenchanting, or state of being disenchanted.
   --Shelton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

disenchantment
    n 1: freeing from false belief or illusions [syn:
         disenchantment, disillusion, disillusionment]