noun (n)

• a light within the field of vision that is brighter than the brightness to which the eyes are adapted(noun.attribute)

  Synonym:
  blaze, glare
  

  source: wordnet30
• the quality of being magnificent or splendid or grand(noun.attribute)

  Example:
  His `Hamlet' lacks the brilliance that one expects.
  

  Synonym:
  grandeur, grandness, magnificence, splendor, splendour
  

  source: wordnet30
• unusual mental ability(noun.cognition)

  Synonym:
  genius
  

  source: wordnet30
• Brilliancy.(noun)

  source: webster1913