Pronunciation: (bril'yunt),[key] —adj. 1. shining brightly; sparkling; glittering; lustrous: the brilliant lights of the city. 2. distinguished; illustrious: a brilliant performance by a young pianist. 3. having or showing great intelligence, talent, quality, etc.: a brilliant technician. 4. strong and clear in tone; vivid; bright: brilliant blues and greens; the brilliant sound of the trumpets. 5. splendid or magnificent: a brilliant social event.
—n. 1. Jewelry.a gem, esp. a diamond, having any of several varieties of the brilliant cut.
2. Print.a size of type about 3½-point.