Dualism

Part of speech: noun (n.)

1. State of being dual or twofold; a twofold division; any system which is founded on a double principle, or a twofold distinction; as:

2. A system which accepts two gods, or two original principles, one good and the other evil.

3. The doctrine that all mankind are divided by the arbitrary decree of God, and in his eternal foreknowledge, into two classes, the elect and the reprobate.