(1):

(n.) The general appearance or aspect; as, the complexion of the sky; the complexion of the news.

(2):

(n.) The bodily constitution; the temperament; habitude, or natural disposition; character; nature.

(3):

(n.) A combination; a complex.

(4):

(n.) The state of being complex; complexity.

(5):

(n.) The color or hue of the skin, esp. of the face.