noun (n)

• the formation of a mental image of something that is not perceived as real and is not present to the senses(noun.cognition)

  Example:
  Popular imagination created a world of demons.
  Imagination reveals what the world could be.
  

  Synonym:
  imaginativeness, vision
  

  source: wordnet30
• the ability to form mental images of things or events(noun.cognition)

  Example:
  He could still hear her in his imagination.
  

  Synonym:
  imagery, imaging, mental imagery
  

  source: wordnet30
• the ability to deal resourcefully with unusual problems(noun.cognition)

  Synonym:
  resource, resourcefulness
  

  source: wordnet30
• The imagine-making power of the mind; the power to create or reproduce ideally an object of sense previously perceived; the power to call up mental imagines.(noun)

  source: webster1913