WordNet (r) 3.0 (2006):

brilliance
    n 1: a light within the field of vision that is brighter than
         the brightness to which the eyes are adapted; "a glare of
         sunlight" [syn: 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" [syn: magnificence,
       brilliance, splendor, splendour, grandeur,
       grandness]
    3: unusual mental ability [syn: brilliance, genius]

Moby Thesaurus II by Grady Ward, 1.0:

190 Moby Thesaurus words for "brilliance":
   Babylonian splendor, Technicolor, ability, acuity, acuteness,
   address, adeptness, adroitness, airmanship, aptitude, aptness,
   artfulness, artisanship, artistry, aura, blare, blaze,
   blaze of glory, blazing light, blinding light, braininess, bravura,
   bright color, bright light, brightness, brilliancy,
   brilliant light, burst of light, capability, capacity, charisma,
   clear thinking, cleverness, color, colorfulness, command,
   competence, control, coordination, craft, craftsmanship, cunning,
   dazzle, dazzling light, deftness, dexterity, dexterousness,
   dextrousness, diplomacy, efficiency, effulgence, elaborateness,
   elegance, envelope, esprit, expertise, facetiousness, facility,
   finesse, flair, flamboyance, flood of light, fulgor, funniness,
   gaiety, genius, giftedness, gifts, glamour, glare, glaring light,
   glitter, gloriousness, glory, gorgeousness, grace, grandeur,
   grandiosity, grandness, grip, halo, handiness, heavenliness,
   horsemanship, humorousness, illustriousness, imposingness,
   impressiveness, ingeniousness, ingenuity, intellect, intelligence,
   intensity, jocoseness, jocularity, joking, joshing,
   keen-wittedness, keenness, know-how, lavishness, light, luster,
   luxuriousness, luxury, magic, magnificence, majesty, marksmanship,
   mastership, mastery, mental alertness, mercurial mind, mystique,
   native cleverness, nimble mind, nimble-wittedness, nimbleness,
   nimbus, nobility, nous, numinousness, pleasantry, plushness,
   poshness, practical ability, precocity, proficiency, proudness,
   prowess, pungency, pure color, quick parts, quick thinking,
   quick wit, quick-wittedness, quickness, radiance, radiancy,
   radiant splendor, ravishingness, readiness, ready wit, refulgence,
   refulgency, resource, resourcefulness, resplendence, resplendency,
   richness, ritziness, sagacity, saltiness, saturation, savoir-faire,
   savvy, seamanship, sharp-wittedness, sharpness, skill,
   skillfulness, smartness, smarts, sparkle, splendidness,
   splendiferousness, splendor, splendorousness, splendrousness,
   sprightly wit, state, stateliness, streaming light, style,
   sublimity, sumptuousness, tact, tactfulness, talent,
   technical brilliance, technical mastery, technical skill,
   technique, timing, virtuosity, vividness, wit, wittiness, wizardry,
   workmanship