(1):

(n.) Imperfect obscurity; a middle degree between light and darkness; twilight; as, the dusk of the evening.

(2):

(v. i.) To grow dusk.

(3):

(a.) Tending to darkness or blackness; moderately dark or black; dusky.

(4):

(n.) A darkish color.

(5):

(v. t.) To make dusk.