shining brightly; sparkling; glittering; lustrous: the brilliant lights of the city.
distinguished; illustrious: a brilliant performance by a young pianist.
having or showing great intelligence, talent, quality, etc.: a brilliant technician.
strong and clear in tone; vivid; bright: brilliant blues and greens; the brilliant sound of the trumpets.
splendid or magnificent: a brilliant social event.
Jewelry. a gem, especially a diamond, having any of several varieties of the brilliant cut.
Printing. a size of type about 3½-point.

1675–85; < French brillant shining, present participle of briller < Italian brillare to glitter (perhaps derivative of an expressive root); see -ant

brilliantly, adverb
brilliantness, noun
overbrilliant, adjective
overbrilliantly, adverb
quasi-brilliant, adjective
quasi-brilliantly, adverb
unbrilliant, adjective
unbrilliantly, adverb
unbrilliantness, noun

1. See bright. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
brilliant (ˈbrɪljənt)
1.  shining with light; sparkling
2.  (of a colour) having a high saturation and reflecting a considerable amount of light; vivid
3.  outstanding; exceptional: a brilliant success
4.  splendid; magnificent: a brilliant show
5.  of outstanding intelligence or intellect: a brilliant mind; a brilliant idea
6.  music
 a.  (of the tone of an instrument) having a large proportion of high harmonics above the fundamental
 b.  brilliant, Also: brilliante with spirit; lively
7.  Also called: brilliant cut
 a.  a popular circular cut for diamonds and other gemstones in the form of two many-faceted pyramids (the top one truncated) joined at their bases
 b.  a diamond of this cut
8.  (formerly) a size of a printer's type approximately equal to 4 point
[C17: from French brillant shining, from briller to shine, from Italian brillare, from brilloberyl]

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

1680s, from Fr. brilliant "sparkling, shining" prp. of briller "to shine" (16c.), from It. brillare "sparkle, whirl," perhaps from V.L. *berillare "to shine like a beryl," from berillus "beryl, precious stone," from L. beryllus (see beryl). In reference to diamonds (1680s)
it means a flat-topped cut invented 17c. by Venetian cutter Vincenzo Peruzzi.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

Brilliant definition

One of five pedagogical languages based on Markov algorithms, used in ["Nonpareil, a Machine Level Machine Independent Language for the Study of Semantics", B. Higman, ULICS Intl Report No ICSI 170, U London (1968)].
See also Diamond, Nonpareil, Pearl, Ruby.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
But he also joined a gift for quick, clever, complex dialogue with a brilliant
  comedic physicality.
Some clones turn a brilliant, shining yellow that almost seems to generate
He's an extremely talented politician, articulate and intelligent, and
  brilliant at the more vulgar end of empathizing.
The bright red leaves of autumn deliver more nutrients to the trees than they
  would without the brilliant coloration.
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