The state of being complex; complexity.
- The natural color, texture, and appearance of the skin, especially of the face.
- General character, aspect, or appearance: findings that will alter the complexion of the problem.
- A viewpoint, inclination, or attitude: a conservative political complexion.
- The combination of the four humors of cold, heat, moistness, and dryness in specific proportions, thought in ancient and medieval physiology to control the temperament and the constitution of the body.