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A central branch of metaphysics is [[ontology]], the investigation into what types of things there are in the world and what relations these things bear to one another. The metaphysician also attempts to clarify the notions by which people understand the world, including [[existence]], objecthood, [[property]], [[space]], [[time]], [[causality]], and possibility.

A central branch of metaphysics is [[ontology]], the investigation into what types of things there are in the world and what relations these things bear to one another. The metaphysician also attempts to clarify the notions by which people understand the world, including [[existence]], objecthood, [[property]], [[space]], [[time]], [[causality]], and possibility.

<center>For lessons on the [[topic]] of '''''Metaphysics''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Metaphysics '''''this link'''''].</center>

<center>For lessons on the [[topic]] of '''''Metaphysics''''', follow [https://nordan.daynal.org/wiki/index.php?title=Category:Metaphysics '''''this link'''''].</center>

Before the development of modern [[science]], scientific questions were addressed as a part of metaphysics known as "[[natural philosophy]]"; the term "science" itself meant "knowledge". The [[scientific method]], however, made natural philosophy an [[empirical]] and [[experiment]]al activity unlike the rest of philosophy, and by the end of the eighteenth century, it had begun to be called "science" in order to distinguish it from [[philosophy]]. Thereafter, metaphysics became the philosophical enquiry of a non-empirical character into the nature of existence. Thus the original situation of metaphysics being integral with (Aristotelian) physics and science, has, in the West, become reversed so that scientists generally consider metaphysics antithetical to the empirical sciences.

Before the development of modern [[science]], scientific questions were addressed as a part of metaphysics known as "[[natural philosophy]]"; the term "science" itself meant "knowledge". The [[scientific method]], however, made natural philosophy an [[empirical]] and [[experiment]]al activity unlike the rest of philosophy, and by the end of the eighteenth century, it had begun to be called "science" in order to distinguish it from [[philosophy]]. Thereafter, metaphysics became the philosophical enquiry of a non-empirical character into the nature of existence. Thus the original situation of metaphysics being integral with (Aristotelian) physics and science, has, in the West, become reversed so that scientists generally consider metaphysics antithetical to the empirical sciences.