noun (n)

• clear or deep perception of a situation(noun.cognition)

  Synonym:
  penetration
  

  source: wordnet30
• a feeling of understanding(noun.feeling)

  Synonym:
  perceptiveness, perceptivity
  

  source: wordnet30
• the clear (and often sudden) understanding of a complex situation(noun.cognition)

  Synonym:
  brainstorm, brainwave
  

  source: wordnet30
• grasping the inner nature of things intuitively(noun.cognition)

  Synonym:
  sixth sense
  

  source: wordnet30
• A sight or view of the interior of anything; a deep inspection or view; introspection; -- frequently used with into.(noun)

  source: webster1913