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dualism, in religion, the doctrine that the world (or reality) consists of two basic, opposed, and irreducible principles that account for all that exists. It has played an important role in the history of thought and of religion. In religion, dualism means the belief in two supreme opposed powers or gods, or sets of divine or demonic beings, that caused the world to exist. It may conveniently be contrasted with monism, which sees the world...