Metaphysics is the branch of philosophy concerned with explaining the ultimate nature of reality, being, and the world. Its name derives from the Greek words μετά (metá) (meaning "above" or "beyond") and φυσικά (physiká) (meaning "above or beyond physics"), "physics" referring to those works on matter by Aristotle in antiquity. Metaphysics addresses questions that have existed for as long as the human race - many still with no definitive answer. Examples are:
There are two distinct views on the meaning of time. One view is that time is part of the fundamental structure of the universe, a dimension in which events occur in sequence, and time itself is something that can be measured. This is the realist's view, to which Sir Isaac Newton subscribed, and hence is sometimes referred to as Newtonian time.
A contrasting view is that time is part of the fundamental intellectual structure (together with space and number). Within this structure, humans sequence events, quantify the duration of events and the intervals between them, and compare the motions of objects. In this second view, time does not refer to any kind of entity that "flows", that objects "move through", or that is a "container" for events. This view is in the tradition of Gottfried Leibniz and Immanuel Kant, in which time, rather than being an objective thing to be measured, is part of the mental measuring system.
He helped inspire two of the century's principal philosophical movements: the Vienna Circle and Oxford ordinary language philosophy. According to an end of the century poll, professional philosophers in Canada and the U.S. rank both his Tractatus Logico-Philosophicus (TLP) and Philosophical Investigations among the top five most important books in twentieth-century philosophy, the latter standing out as "...the one crossover masterpiece in twentieth-century philosophy, appealing across diverse specializations and philosophical orientations".
^Geisler, Norman L. "Baker Encyclopedia of Christian Apologetics" page 446. Baker Books, 1999.
^More specifically, the writings concerning what Aristotle called the "first philosophy" – and what is now called "metaphysics" – appeared after his articles on matter (on "physics"). Hence meta- ("above/beyond") physics ("matter").