1 the state of being twofold or double
2 (Philosophy) the doctrine, as opposed to idealism and materialism, that reality consists of two basic types of substance usually taken to be mind and matter or two basic types of entity, mental and physical
a the theory that the universe has been ruled from its origins by two conflicting powers, one good and one evil, both existing as equally ultimate first causes
b the theory that there are two personalities, one human and one divine, in Christ
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