What subfield of philosophy is concerned with the ultimate characteristics of reality or existence?

metaphysics, branch of philosophy whose topics in antiquity and the Middle Ages were the first causes of things and the nature of being. In postmedieval
philosophy, however, many other topics came to be included under the heading “metaphysics.” (The reasons for this development will be discussed in the body of the article.)

Nature and scope of metaphysics

In the 4th century bce the Greek philosopher Aristotle wrote a treatise about what he variously called “first philosophy,” “first science,” “wisdom,” and “theology.” In the 1st century bce, an editor of his works gave that treatise the title Ta meta ta physika, which means, roughly, “the ones [i.e., books] after the ones about nature.” “The ones about nature”
are those books that make up what is today called Aristotle’s Physics, as well other writings of his on the natural world. The Physics is not about the quantitative science now called physics; instead, it concerns philosophical problems about sensible and mutable (i.e., physical) objects. The title Ta meta ta physika probably conveyed the editor’s opinion that students of Aristotle’s
philosophy should begin their study of first philosophy only after they had mastered the Physics. The Latin singular noun metaphysica was derived from the Greek title and used both as the title of Aristotle’s treatise and as the name of its subject matter. Accordingly, metaphysica is the root of the words for
metaphysics in almost all western European languages (e.g., metaphysics, la métaphysique, die Metaphysik).

Aristotle provided two definitions of first philosophy: the study of “being as such” (i.e., the nature of being, or what it is for a thing to be or to exist) and the study of “the first causes of
things” (i.e., their original or primary causes). The relation between these two definitions is a much-debated question. Whatever its answer may be, however, it is clear that the subject matter of what is today called metaphysics cannot be identified with that of Aristotle’s Metaphysics. While it is certainly true that all the problems that Aristotle considered in his
treatise are still said to belong to metaphysics, since at least the 17th century the word metaphysics has been applied to a much wider range of questions. Indeed, if Aristotle were somehow able to examine a present-day textbook on metaphysics, he would classify much of its content not as metaphysics but as physics, as he understood the latter term. To take only one example,
the modern book would almost certainly contain a great deal of discussion of philosophical problems regarding the identity of material objects (i.e., the conditions under which material objects are numerically the same as, or different from, each other; see below Problems in metaphysics: Identity). An ancient example of such a problem is the following: A statue is formed by
pouring molten gold into a certain mold. The statue is then melted down and the molten gold poured into the same mold and allowed to cool and solidify. Is the resulting statue the same statue as the original? Such problems evidently do not concern (at least not directly) either being as such or the
first causes of things.

The question of why modern metaphysics is a much broader field than the one conceived by Aristotle is not easy to answer. Some partial or contributing causes, however, may be the following.

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• 1. The appropriation of the word physics by the quantitative science that now bears that name, with the result that some problems that Aristotle would have regarded as belonging
  to “physics” could no longer be so classified. As regards the problem of the gold statue, for example, modern physics can explain why the melting point of gold is lower than the melting point of iron, but it has nothing to say about the identity of recast statues. (It should be pointed out that metaphysicians are not interested in
  recast statues—or any other remade physical object—as such. Rather, they use such examples to pose very general and abstract questions about time, change, composition, and identity and as illustrations of the application of principles that may govern those concepts.)

• 2. Similarity of method
  between Aristotelian and modern metaphysics. The American philosopher William James (1842–1910) said, “Metaphysics means only an unusually obstinate attempt to think clearly and consistently.” That is not a bad statement of the only method that is available to students of metaphysics in either its original Aristotelian sense or in its more recent extended sense. If one is interested in questions about the nature of
  being, the first causes of things, the identity of physical objects, or the nature of causation (the last two problems belong to metaphysics in its modern sense but not its original sense), one will find that the only method available is an “obstinate attempt to think clearly and consistently” about them.
  (Perhaps, indeed, this is the only method available in any branch of philosophy.)

• 3. Overlap of subject matter between Aristotelian metaphysics and Aristotelian physics. The topics “being as such” and “the first causes of things” cannot be wholly divorced from philosophical problems about sensible and mutable objects, the original subject matter of Aristotle’s physics. Sensible and mutable objects, after all, are—that is, they exist—and, if indeed there are first causes
  of things, they certainly stand in causal relations to those first causes.

Whatever the reasons may be, the set of problems to which the word metaphysics now applies is so diverse that it is very hard to frame a definition that adequately expresses the nature and scope of the
discipline. Such traditional definitions as “an investigation into the nature of being,” “an attempt to describe the reality that lies behind all appearances,” and “an investigation into the first principles of things” are not only vague and barely informative but also
positively inaccurate: each of them is either too broad (it can be applied just as plausibly to philosophical disciplines other than metaphysics) or too narrow (it cannot be applied to some problems that are paradigmatically metaphysical). Thus, the only way to give a useful account of the nature and scope of metaphysics as the term is now understood is to provide a survey
of a series of philosophical problems that uncontroversially belong to modern metaphysics. That survey follows.