Webster's Revised Unabridged Dictionary · 1913

Brightness

Brightness , noun

[Anglo-Saxon beorhines. See Bright.]

1.
The quality or state of being bright; splendor; luster; brilliancy; clearness.
A sudden brightness in his face appear. — Crabbe
2.
Acuteness (of the faculties); sharpness 9wit.
The brightness of his parts... distinguished him. — Prior