1.Definition: an erroneous mental representation

Related Noun(s):semblance

Category: General

2.Definition: an illusory feat; considered magical by naive observers

Related Noun(s):conjuration, deception, legerdemain, magic, thaumaturgy, trick

Category: General

3.Definition: something many people believe that is false

"They have the illusion that I am very wealthy"

Related Noun(s):fancy, fantasy, phantasy

Category: General

4.Definition: the act of deluding; deception by creating illusory ideas

Related Noun(s):delusion

Category: General