brilliance in WordNet English dictionary

1. a light within the field of vision that is brighter than the brightness to which the eyes are adapted
   "a glare of sunlight"
   glare  blaze  brilliance 
   
2. the quality of being magnificent or splendid or grand
   "for magnificence and personal service there is the Queen's hotel"; "his `Hamlet' lacks the brilliance that one expects"; "it is the university that gives the scene its stately splendor"; "an imaginative mix of old-fashioned grandeur and colorful art"; "advertisers capitalize on the grandness and elegance it brings to their products"
   magnificence  brilliance  splendor  splendour  grandeur  grandness 
   
3. unusual mental ability
   brilliance  genius 
   

brilliance in English Wiktionary