Noun. 1. complexion-the coloring of a person's face. skin color, skin colour. color, coloring, colouring, colour-a visual attribute of things that results from the light they emit or transmit or reflect; a white color is made up of many different wavelengths of light.ee also skin. achromasia. absence of pigmentation in the skin. chlorosis. greensickness; a disease of girls in puberty, characterized by, among other symptoms, greenishness of the complexion. erythrism. a redness of beard and hair and ruddiness of complexion. — erythristic, erythrismal, adj.