Commonly Confused Words:  allusion / illusion / delusion

Allusion is a noun that means an indirect but meaningful reference .

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Illusion is a noun.  It can mean

• an erroneous perception of reality
• an erroneous concept or belief
• the condition of being deceived by a false perception

   Example

Delusion is a noun.  It means a false belief held in spite of invalidating evidence.

   Example

Link to exercises on allusion / illusion / delusion.