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see metaphysicsmetaphysics
, branch of philosophy concerned with the ultimate nature of existence. It perpetuates the Metaphysics of Aristotle, a collection of treatises placed after the Physics [Gr.
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the branch of philosophy (and metaphysics) concerned to establish the nature of the fundamental kinds of thing which exist in the world (e.g. do MINDS exist?). Examples of philosophical ontological theory are PLATO's theory of ‘forms’, or recently, SCIENTIFIC REALISM, which asks what kinds of thing are presupposed by scientific theories.

Ontological arguments are also an explicit (or implicit) feature of sociological theory itself, e.g. DURKHEIM's conception of'social facts, WEBER's (or the SYMBOLIC INTERACTIONIST'S) emphasis on individual actors, or MARX's materialism and emphasis on modes and relations in production.

One argument (HUME's view) is that ontological inquiries are bound to be inconclusive, or are even pointless. Against this, the clarification of underlying assumptions is often important. Undoubtedly debate in sociology since COMTE, much of it broadly ontological in nature, has done much to clarify the nature, while also underlining the very great complexity, of social reality (social action, social structures, etc.). However, it has done so not as a separate realm of inquiry, but as an inherent part of sociological inquiry properly conducted. Philosophy can inform these discussions, but it is no longer regarded as the kind of final arbiter it was once assumed to be. The expectation must be that ontologies will change as knowledge and individual sciences and modes of study change (compare EPISTEMOLOGY, KUHN, FEYERABEND).



a subdivision of philosophy that studies universal principles of being, its structure and its laws. Essentially, ontology expresses a picture of the world that corresponds to a particular level in the knowledge of reality and that is recorded in a system of philosophical categories characteristic of a particular period and philosophical tradition (for example, materialism and idealism). In this sense, every philosophical and, in general, every theoretical system rests on certain ontological concepts that constitute its stable content foundation but that change as cognition develops.

The term “ontology” was first used in the philosophical lexicon (1613) of R. Goclenius (Germany) as a synonym for metaphysics. It gained currency in the school of C. Wolff, for whom ontology came to signify the primary fundamental part of metaphysics, concerned with definitions of being as such. Until the early 19th century, ontology developed on the basis of speculation and consisted chiefly of ideas concerning the hidden essences of things. The flimsiness of these teachings on being was criticized by German classical philosophy and was fully surmounted by Marxism, which demonstrated the necessary ties among and unity of ontology, epistemology, and logic and, consequently, the dependence of ontological concepts on the existing level and forms of cognition.

In the 20th century the heightened level of abstract scientific cognition has presented certain basic ontological problems—the construction of an adequate ontological interpretation of abstract concepts of modern science (for example, cosmology and the physics of elementary particles) and the creation of a theoretical foundation for modern methodological approaches and trends (for example, the ontological basis of a systems approach, or of cybernetics). The issue of ontology is discussed in contemporary Marxist literature. Although some Marxist philosophers believe that ontology is not entitled to an independent existence, others assert that it should be a special branch of dialectical materialism.

Attempts to restate problems of ontology in a new, primarily subjective, personal vein, as a matter of the strata and levels of being of the personality, are characteristic of a number of schools of modern bourgeois philosophy, particularly phenomenology, existentialism, and personalism. This line of thought reflects the world view of the pessimistic, alienated individual.



1. Philosophy the branch of metaphysics that deals with the nature of being
2. Logic the set of entities presupposed by a theory


A systematic account of Existence.


(artificial intelligence)
(From philosophy) An explicit formal specification of how to represent the objects, concepts and other entities that are assumed to exist in some area of interest and the relationships that hold among them.

For AI systems, what "exists" is that which can be represented. When the knowledge about a domain is represented in a declarative language, the set of objects that can be represented is called the universe of discourse. We can describe the ontology of a program by defining a set of representational terms. Definitions associate the names of entities in the universe of discourse (e.g. classes, relations, functions or other objects) with human-readable text describing what the names mean, and formal axioms that constrain the interpretation and well-formed use of these terms. Formally, an ontology is the statement of a logical theory.

A set of agents that share the same ontology will be able to communicate about a domain of discourse without necessarily operating on a globally shared theory. We say that an agent commits to an ontology if its observable actions are consistent with the definitions in the ontology. The idea of ontological commitment is based on the Knowledge-Level perspective.


(information science)
The hierarchical structuring of knowledge about things by subcategorising them according to their essential (or at least relevant and/or cognitive) qualities. See subject index. This is an extension of the previous senses of "ontology" (above) which has become common in discussions about the difficulty of maintaining subject indices.


From the Greek words "onto" and "logia," which means the study of being (that which is), an ontology defines the relationships between things. The terms taxonomy and ontology are often used to represent a formal classification of some subject; however, a taxonomy typically defines one category of items in a hierarchical tree structure; whereas an ontology shows the relationships between items in different categories in a graph model.

Ontological Vocabularies
There are numerous vocabularies on the Web that define the data interrelationships on the Semantic Web. Whereas the World Wide Web links Web pages together, the Semantic Web links the data on the Web that are related. See taxonomy, linked open data and Semantic Web.
References in periodicals archive ?
29) This view of the "truthmaker" ontologist is similar to that expressed by Fox, who proposes the following "truthmaker" principle:
The condemnations do remain valid if the propositions are understood from an idealist or ontologist point of view, with a meaning contrary to the Catholic faith.
First, Grossmann is correct to centre the naturalist/ ontologist debate on the existence and nature of properties.
To the aspiring ontologist, this place might well be the best point to start because it is fairly straightforward and discusses a particular effort in ontology tool support at the Polytechnic University of Madrid.
The Seinsfrage is not an ethical question, and the ontologist does not ask about ethics because the question concerning the meaning of being already reflects the deepest ethical determination of Dasein because philosophy is a caring way of life and ontological questioning embraces the ethical.
Of course, it soon becomes evident when working as an ontologist in the product and service space that everything becomes relevant, from the upper-ontology notions (Guarino and Welty 2002) of part and whole (mereology), (17) notions of necessity and sufficiency of properties, distinguishability, change of properties, task, and process concepts, to so-called middle-ontology notions of product and service, to domain-ontology levels.
This is particularly evident in Heidegger's 'ontological' interpretation of the phenomenological 'we', which equates it with the fundamental ontologist of Being and Time, and hence claims that the Phenomenology is grounded in a fundamental presupposition--the absolute knowledge of Being.
In any case, the fact that intuitionism can be said to derive its rules from mentally effective operations does not preclude the thesis that these rules correctly prescribe what is expressible of being; the intuitionist ontologist would have no difficulty in turning the tables here, for she is always entitled to retort that the classical ontologist applies, onto being, rules which come from a doctrine of mentally effective operations regarding finite collections, an accusation which is twice as damning when the rights to an ontology of infinite multiples are at stake.
But it was the systematic, comprehensive Blanchard, the imaginative Northrop, and the brilliant dialectician, metaphysician, and ontologist Paul Weiss who gave the department its majesty.
Where the epistemologist asks what we can know with confidence, the ontologist asks what there is.
The later Wittgenstein is read not as a regional ontologist of independent forms of life but as a kind of postmodern semiotician for whom each language game is arbitrary.
Hunting in itself is the hidden hunting of the hidden or elusive beings, and applies across the board to what the philosopher as ontologist does; but the hunting by the sophist of rich young men has nothing to do with what the Stranger does and everything to do with what Socrates does.

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