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metaphysics
noun
- the branch of philosophy that deals with first principles and seeks to explain the nature of being or reality (ontology) and of the origin and structure of the universe (cosmology): it is closely associated with the study of the nature of knowledge (epistemology)
- speculative philosophy in general
- esoteric, often mystical or theosophical, lore
- the theory or principles (of some branch of knowledge)
- popularly any very subtle or difficult reasoning
See metaphysics in American Heritage Dictionary 4
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