| brightness | (n) the location of a visual perception along a continuum from black to white, Ant. dullness |
| brightness | (n) intelligence as manifested in being quick and witty, Syn. smartness, cleverness |
| brightness constancy | (n) the tendency for a visual object to be perceived as having the same brightness under widely different conditions of illumination |
| Brightness | n. [ AS. beorhines. See Bright. ] A sudden brightness in his face appear. Crabbe. [ 1913 Webster ] The brightness of his parts . . . distinguished him. Prior. [ 1913 Webster ] |