Definition of "Complexion" :

noun: (obsolete) a combination of elements (of dryness and warmth or of the four humors) that was once believed to determine a person's health and temperament

noun: texture and appearance of the skin of the face

noun: the coloring of a person's face

noun: a point of view or general attitude or inclination

"He altered the complexion of his times."

noun: a combination that results from coupling or interlinking

"Diphthongs are complexions of vowels."

verb: give a certain color to

"The setting sun complexioned the hills."