What does "brightness" mean?

Brightness: Acuteness (of the faculties); sharpness 9wit. The brightness of his parts . . . distinguished him. Prior. BRIGHT'S DISEASE Bright's" dis*ease". Etym: [From Dr. Bright of London, who first described it.] (Med.) An affection of the kidneys, usually inflammatory in character, and distinguished by the occurrence of albumin and renal casts in the urine. Several varieties of Bright's disease are now recognized, differing in the part of the kidney involved, and in the intensity and course of the morbid process.