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.

1745–55; brilli(ant) + -ance

overbrilliance, noun

1. radiance, effulgence, refulgence. 2. illustriousness, preeminence; genius.

1, 2. dullness. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
brilliance or brilliancy (ˈbrɪljəns)
1.  great brightness; radiance
2.  excellence or distinction in physical or mental ability; exceptional talent
3.  splendour; magnificence: the brilliance of the royal court
4.  physics a former term for luminance
brilliancy or brilliancy

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1755, from brilliant (q.v.). Figurative sense (of wit, intelligence, etc.) is from 1779. Distinguished from brilliancy in that the latter usually is applied to things measurable in degrees.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
She could see the hidden life in things, their detailed brilliance, the
  funneled genius that went into making them what they are.
However, the brilliance of genius always keeps as many polar belief options in
  their library as possible.
He wrote with a great impression of ease, yet he obtained an effect of great
  brilliance and felicity.
Cunningly placed lights raise the whole elaborate show to the highest point of
Images for brilliance
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