1. state of having two parts: a state in which something has two distinct parts or aspects, which are often opposites
2. theory of two opposing concepts: a philosophical theory based on the idea of opposing concepts, especially the theory that human beings are made up of two independent constituents, the body and the mind or soul
3. doctrine of opposing principles: the religious doctrine that two opposed and antagonistic forces of good and evil determine the course of events
4. religion dual nature of people: the religious idea that people are inherently dual in nature, both spiritual and physical
