great brightness; luster

the brilliance of a fine diamond.

excellence or distinction; conspicuous talent, mental ability, etc.

splendor, elegance, or magnificence

the brilliance of the court of Louis XIV.

Optics . that luminance of a body consisting of its saturation and brightness.

noun

brilliancy , luminosity , radiance , genius , inspiration , glory , gorgeousness , magnificence , resplendence , resplendency , sparkle , sumptuousness