Source : Webster's Revised Unabridged Dictionary (1913)

Disillusion \Dis`il*lu"sion\, n.
   The act or process of freeing from an illusion, or the state
   of being freed therefrom. --Lowell.

Disillusion \Dis`il*lu"sion\, v. t.
   To free from an illusion; to disillusionize.

Source : WordNet®

disillusion
     n : freeing from false belief or illusions [syn: {disenchantment},
          {disillusionment}]
     v : free from enchantment [syn: {disenchant}] [ant: {enchant}]