noun.
The state or quality of being bright; splendor; luster; glitter: as, “the brightness of the sun,” Acts xxvi. 13.
noun.
Acuteness of intellect or faculty; sharpness of wit.
noun.
Cheer; cheerfulness.
noun.
Synonyms Brilliancy, effulgence.—2. Acumen, mother-wit, ingenuity.