1. An erroneous mental representation
   - semblance 
2. Something many people believe that is false
   "they have the illusion that I am very wealthy"
   - fantasy, phantasy [archaic], fancy 
3. The act of deluding; deception by creating illusory ideas
   - delusion, head game 
4. An illusory feat; considered magical by naive observers
   - magic trick, conjuring trick, trick, magic, legerdemain, conjuration, thaumaturgy, deception

Sounds like: elusion, allusion

Derived forms: illusions

See also: illusional, illusionist, illusory

Type of: appearance, deceit, deception, dissembling, dissimulation, misconception, performance

Encyclopedia: Illusion

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