noun (n)

• something many people believe that is false(noun.cognition)

  Synonym:
  fancy, fantasy, illusion
  

  source: wordnet30
• fiction with a large amount of imagination in it(noun.communication)

  Synonym:
  fantasy
  

  source: wordnet30
• imagination unrestricted by reality(noun.cognition)

  source: wordnet30
• See Fantasy, and Fancy.(noun)

  source: webster1913