illusion
1. [ noun ] an erroneous mental representation
Synonyms: semblance
Related terms: appearance apparition irradiation phantom_limb
2. [ noun ] something many people believe that is false
Synonyms: phantasy fancy fantasy
Examples:

"they have the illusion that I am very wealthy"

Related terms: misconception wishful_thinking will-o'-the-wisp bubble visualize
3. [ noun ] deception by creating illusory ideas
Synonyms: head_game
Related terms: deception
4. [ noun ] the act of deluding; deception by creating illusory ideas
Synonyms: head_game delusion
Related terms: deception deceive
5. [ noun ] (performing arts) an illusory feat; considered magical by naive observers
Synonyms: trick conjuring_trick magic legerdemain deception conjuration magic_trick
Related terms: performance prestidigitation card_trick
Similar spelling:   illusional
  illusionist
  illusionary