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ontology
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Definition:
Ontology is the branch of philosophy which deals with the study of the nature of reality: what is it, how many "realities" are there, what are its properties, etc. The word is derived from the Greek terms on, which means "reality" and logos, which means "study of."

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What is Metaphysics?
In Western philosophy, metaphysics has become the study of the fundamental nature of all reality - what is it, why is it, and how are we to understand it. Some only regard metaphysics as the study of "higher" reality or the "invisible" nature behind everything, but that isn't actually true. It is, instead, the study of all of reality, visible and invisible.

What is Philosophy?
What is philosophy? Is there any point in studying philosophy, or is it a useless subject? What are the different branches of philosophy - what's the difference between aestheitcs and ethics? What's the difference between metaphysics and epistemology?

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