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."