WordWeb Online

1. An erroneous mental representation
   "Artists use perspective in art to create an illusion of depth.";
   - semblance
    
2. Something that many people believe but 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: Eyck, sion, elusion, allu

Derived forms: illusions

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

Encyclopedia: Illusion, Coma, Pimp & Circumstance