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Ontology is the philosophical study of the nature of being, becoming, existence, or reality, as well as the basic categories of being and their relations. Traditionally listed as a part of the major branch of philosophy known as metaphysics, ontology deals with questions concerning what entities exist or can be said to exist, and how such entities can be grouped, related within a hierarchy, and subdivided according to similarities and differences.
Ontology, in analytic philosophy, concerns the determination whether some categories of being are fundamental and asks in what sense can the items in those categories be said to "be." It is the inquiry into being in so much as it is being ("being qua being"), or into beings insofar as they exist—and not insofar as, for instance, particular facts can be obtained about them or particular properties belong to them.
Some philosophers, notably of the Platonic school, contend that all nouns (including abstract nouns) refer to existent entities. Other philosophers contend that nouns do not always name entities, but that some provide a kind of shorthand for reference to a collection of either objects or events. In this latter view, mind, instead of referring to an entity, refers to a collection of mental events experienced by a person; society refers to a collection of persons with some shared characteristics, and geometry refers to a collection of a specific kind of intellectual activity. Between these poles of realism and nominalism, there are also a variety of other positions; but any ontology must give an account of which words refer to entities, which do not, why, and what categories result. When one applies this process to nouns such as electrons, energy, contract, happiness, space, time, truth, causality, and God, ontology becomes fundamental to many branches of philosophy.
Some fundamental questions 
Principal questions of ontology are "What can be said to exist?", "Into what categories, if any, can we sort existing things?", "What are the meanings of being?", "What are the various modes of being of entities?". Various philosophers[who?] have provided different answers to these questions.
One common approach is to divide the extant subjects and predicates into groups called categories. Of course, such lists of categories differ widely from one another, and it is through the co-ordination of different categorical schemes that ontology relates to such fields as library science and artificial intelligence. Such an understanding of ontological categories, however, is merely taxonomic, classificatory. The categories are, properly speaking, the ways in which a being can be addressed simply as a being, such as what it is (its 'whatness', quidditas or essence), how it is (its 'howness' or qualitativeness), how much it is (quantitativeness), where it is, its relatedness to other beings, etc.
Further examples of ontological questions include:
- What is existence, i.e. what does it mean for a being to be?
- Is existence a property?
- Is existence a genus or general class that is simply divided up by specific differences?
- Which entities, if any, are fundamental? Are all entities objects?
- How do the properties of an object relate to the object itself?
- What features are the essential, as opposed to merely accidental attributes of a given object?
- How many levels of existence or ontological levels are there? And what constitutes a 'level'?
- What is a physical object?
- Can one give an account of what it means to say that a physical object exists?
- Can one give an account of what it means to say that a non-physical entity exists?
- What constitutes the identity of an object?
- When does an object go out of existence, as opposed to merely changing?
- Do beings exist other than in the modes of objectivity and subjectivity, i.e. is the subject/object split of modern philosophy inevitable?
Essential ontological dichotomies include:
- Universals and particulars
- Substance and accident
- Abstract and concrete objects
- Essence and existence
- Determinism and indeterminism
Ontologies are classified in various ways using criteria such as the degree of abstraction and field of application:
- Upper ontology: concepts supporting development of an ontology, meta-ontology
- Domain ontology: concepts relevant to a particular topic or area of interest, for example, information technology or computer languages, or particular branches of science
- Interface ontology: concepts relevant to the juncture of two disciplines
- Process ontology: inputs, outputs, constraints, sequencing information, involved in business or engineering processes
The word ontology is a compound word, composed of onto-, from the Greek ὄν, on (gen. ὄντος, ontos), i.e. "being; that which is", which is the present participle of the verb εἰμί, eimi, i.e. "to be, I am", and -λογία, -logia, i.e. "science, study, theory".
While the etymology is Greek, the oldest extant record of the word itself is the New Latin form ontologia, which appeared in 1606, in the work Ogdoas Scholastica by Jacob Lorhard (Lorhardus) and in 1613 in the Lexicon philosophicum by Rudolf Göckel (Goclenius); see classical compounds for this type of word formation.
The first occurrence in English of "ontology" as recorded by the OED (Oxford English Dictionary, second edition, 1989) appears in Nathaniel Bailey's dictionary of 1721, which defines ontology as 'an Account of being in the Abstract' - though, of course, such an entry indicates the term was already in use at the time. It is likely the word was first used in its Latin form by philosophers based on the Latin roots, which themselves are based on the Greek.
The current on-line edition of the OED (Draft Revision September 2008) gives as earliest documented occurrence in English a work by Gideon Harvey (1636/7-1702): Archelogia philosophica nova; or, New principles of Philosophy. Containing Philosophy in general, Metaphysicks or Ontology, Dynamilogy or a Discourse of Power, Religio Philosophi or Natural Theology, Physicks or Natural philosophy - London, Thomson, 1663.
Parmenides and monism 
Parmenides was among the first to propose an ontological characterization of the fundamental nature of existence. In his prologue or proem he describes two views of existence; initially that nothing comes from nothing, and therefore existence is eternal. Consequently our opinions about truth must often be false and deceitful. Most of western philosophy, and science - including the fundamental concepts of falsifiability and the conservation of energy - have emerged from this view. This posits that existence is what can be conceived of by thought, created, or possessed. Hence, there can be neither void nor vacuum; and true reality can neither come into being nor vanish from existence. Rather, the entirety of creation is eternal, uniform, and immutable, though not infinite (he characterized its shape as that of a perfect sphere). Parmenides thus posits that change, as perceived in everyday experience, is illusory. Everything that can be apprehended is but one part of a single entity. This idea somewhat anticipates the modern concept of an ultimate grand unification theory that finally explains all of existence in terms of one inter-related sub-atomic reality which applies to everything.
Ontological pluralism 
The opposite of eleatic monism is the pluralistic conception of Being. In the 5th century BC, Anaxagoras and Leucippus replaced  the reality of Being (unique and unchanging) with that of Becoming and therefore by a more fundamental and elementary ontic plurality. This thesis originated in the Hellenic world, stated in two different ways by Anaxagoras and by Leucippus. The first theory dealt with "seeds" (which Aristotle referred to as "homeomeries") of the various substances. The second was the atomistic theory, which dealt with reality as based on the vacuum, the atoms and their intrinsic movement in it.
The materialist Atomism proposed by Leucippus was indeterminist, but then developed by Democritus in a deterministic way. It was later (4th century BC) that the original atomism was taken again as indeterministic by Epicurus. He confirmed the reality as composed of an infinity of indivisible, unchangeable corpuscles or atoms (atomon, lit. 'uncuttable'), but he gives weight to characterize atoms while for Leucippus they are characterized by a "figure", an "order" and a "position" in the cosmos. They are, besides, creating the whole with the intrinsic movement in the vacuum, producing the diverse flux of being. Their movement is influenced by the Parenklisis (Lucretius names it Clinamen) and that is determined by the chance. These ideas foreshadowed our understanding of traditional physics until the nature of atoms was discovered in the 20th century.
Plato developed this distinction between true reality and illusion, in arguing that what is real are eternal and unchanging Forms or Ideas (a precursor to universals), of which things experienced in sensation are at best merely copies, and real only in so far as they copy ('partake of') such Forms. In general, Plato presumes that all nouns (e.g., 'Beauty') refer to real entities, whether sensible bodies or insensible Forms. Hence, in The Sophist Plato argues that Being is a Form in which all existent things participate and which they have in common (though it is unclear whether 'Being' is intended in the sense of existence, copula, or identity); and argues, against Parmenides, that Forms must exist not only of Being, but also of Negation and of non-Being (or Difference).
In his Categories, Aristotle identifies ten possible kinds of things that can be the subject or the predicate of a proposition. For Aristotle there are four different ontological dimensions:
- i) according to the various categories or ways of addressing a being as such
- ii) according to its truth or falsity (e.g. fake gold, counterfeit money)
- iii) whether it exists in and of itself or simply 'comes along' by accident
- iv) according to its potency, movement (energy) or finished presence (Metaphysics Book Theta).
According to Avicenna, and in an interpretation of Greek Aristotelian and Platonist ontological doctrines in medieval metaphysics, being is either necessary, contingent qua possible, or impossible. Necessary being is that which cannot but be, since its non-being entails a contradiction. Contingent qua possible being is neither necessary nor impossible for it to be or not to be. It is ontologically neutral, and is brought from potential existing into actual existence by way of a cause that is external to its essence. Its being is borrowed unlike the necessary existent, which is self-subsisting and is impossible for it not to be. As for the impossible, it necessarily does not exist, and the affirmation of its being is a contradiction.
Other ontological topics 
Ontological and epistemological certainty 
René Descartes, with "je pense donc je suis" or "cogito ergo sum" or "I think, therefore I am", argued that "the self" is something that we can know exists with epistemological certainty. Descartes argued further that this knowledge could lead to a proof of the certainty of the existence of God, using the ontological argument that had been formulated first by Anselm of Canterbury.
Certainty about the existence of "the self" and "the other", however, came under increasing criticism in the 20th century. Sociological theorists, most notably George Herbert Mead and Erving Goffman, saw the Cartesian Other as a "Generalized Other", the imaginary audience that individuals use when thinking about the self. According to Mead, "we do not assume there is a self to begin with. Self is not presupposed as a stuff out of which the world arises. Rather the self arises in the world"  The Cartesian Other was also used by Sigmund Freud, who saw the superego as an abstract regulatory force, and Émile Durkheim who viewed this as a psychologically manifested entity which represented God in society at large.
Body and environment, questioning the meaning of being 
Schools of subjectivism, objectivism and relativism existed at various times in the 20th century, and the postmodernists and body philosophers tried to reframe all these questions in terms of bodies taking some specific action in an environment. This relied to a great degree on insights derived from scientific research into animals taking instinctive action in natural and artificial settings—as studied by biology, ecology, and cognitive science.
The processes by which bodies related to environments became of great concern, and the idea of being itself became difficult to really define. What did people mean when they said "A is B", "A must be B", "A was B"...? Some linguists advocated dropping the verb "to be" from the English language, leaving "E Prime", supposedly less prone to bad abstractions. Others, mostly philosophers, tried to dig into the word and its usage. Heidegger distinguished human being as existence from the being of things in the world. Heidegger proposes that our way of being human and the way the world is for us are cast historically through a fundamental ontological questioning. These fundamental ontological categories provide the basis for communication in an age: a horizon of unspoken and seemingly unquestionable background meanings, such as human beings understood unquestioningly as subjects and other entities understood unquestioningly as objects. Because these basic ontological meanings both generate and are regenerated in everyday interactions, the locus of our way of being in a historical epoch is the communicative event of language in use. For Heidegger, however, communication in the first place is not among human beings, but language itself shapes up in response to questioning (the inexhaustible meaning of) being. Even the focus of traditional ontology on the 'whatness' or 'quidditas' of beings in their substantial, standing presence can be shifted to pose the question of the 'whoness' of human being itself.
Ontology and language 
Some philosophers suggest that the question of "What is?" is (at least in part) an issue of usage rather than a question about facts. This perspective is conveyed by an analogy made by Donald Davidson: Suppose a person refers to a 'cup' as a 'chair' and makes some comments pertinent to a cup, but uses the word 'chair' consistently throughout instead of 'cup'. One might readily catch on that this person simply calls a 'cup' a 'chair' and the oddity is explained. Analogously, if we find people asserting 'there are' such-and-such, and we do not ourselves think that 'such-and-such' exist, we might conclude that these people are not nuts (Davidson calls this assumption 'charity'), they simply use 'there are' differently than we do. The question of What is? is at least partially a topic in the philosophy of language, and is not entirely about ontology itself. This viewpoint has been expressed by Eli Hirsch. Hirsch interprets Hilary Putnam as asserting that different concepts of "the existence of something" can be correct. This position does not contradict the view that some things do exist, but points out that different 'languages' will have different rules about assigning this property. How to determine the 'fitness' of a 'language' to the world then becomes a subject for investigation.
Prominent ontologists 
See also 
- Griswold, Charles L. (2001). Platonic writings/Platonic readings. Penn State Press. p. 237. ISBN 9780271021379.
- Aristotle Categories Vol. 1, Loeb Classical Library, transl. H.P. Cooke, Harvard U.P. 1983
- Vesselin Petrov (2011). "Chapter VI: Process ontology in the context of applied philosophy". In Vesselin Petrov, ed. Ontological Landscapes: Recent Thought on Conceptual Interfaces Between Science and Philosophy. Ontos Verlag. pp. 137 ff. ISBN 3868381074.
- "ontology". Online Etymology Dictionary.
- εἰμί. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at Perseus Project
- "Sample Chapter for Graham, D.W.: Explaining the Cosmos: The Ionian Tradition of Scientific Philosophy". Press.princeton.edu. Retrieved 2010-02-21.
- "Ancient Atomism (Stanford Encyclopedia of Philosophy)". Plato.stanford.edu. Retrieved 2010-02-21.
- Aristotle, Metaphysics, I , 4, 985
- Nader El-Bizri, 'Avicenna and Essentialism, Review of Metaphysics, Vol. 54 (2001), pp. 753-778.
- Hyde, R. Bruce. "Listening Authentically: A Heideggerian Perspective on Interpersonal Communication". In Interpretive Approaches to Interpersonal Communication, edited by Kathryn Carter and Mick Presnell. State University of New York Press, 1994.
- Mead, G. H. The individual and the social self: Unpublished work of George Herbert Mead (D. L. Miller, Ed.). Chicago: University of Chicago Press, 1982. (p. 107).
- Barry Smith: Objects and Their Environments: From Aristotle to Ecological Ontology The Life and Motion of SocioEconomic Units (GISDATA 8), London: Taylor and Francis, 2001, 79-97.
- Heidegger, Martin, On the Way to Language Harper & Row, New York 1971. German edition: Unterwegs zur Sprache Neske, Pfullingen 1959.
- Eldred, Michael, Social Ontology: Recasting Political Philosophy Through a Phenomenology of Whoness ontos, Frankfurt 2008 xiv + 688 pp. ISBN 978-3-938793-78-7
- Davidson refers to a 'ketch' and a 'yawl'; see p. 18 in Donald Davidson (1974). "On the very idea of a conceptual scheme". Proceedings and Address of the American Philosophical Association 47: 5–20.
- Uriah Krieger (2011). "Two defenses of common-sense ontology". Dialectica 65 (2). pp. 177–204. doi:10.1111/j.1746-8361.2011.01262.x.
- Hirsch, Eli (2011). "Chapter 9: Physical-object ontology, verbal disputes and common sense". Quantifier Variance and Realism: Essays in Metaontology. Oxford University Press. pp. 144–177. ISBN 9780199732111. First published as “Physical-Object Ontology, Verbal Disputes, and Common Sense”
- Hirsch, Eli (2011). "Chapter 5: Quantifier variance and realism". Quantifier Variance and Realism: Essays in Metaontology. Oxford University Press. pp. 68–95. ISBN 9780199732111. First published as “Quantifier variance and realism”
- Hirsch, E. (2004). "Sosa’s Existential Relativism". In John Greco, ed. Ernest Sosa and His Critics. Blackwell. pp. 224–232. ISBN 0470755474.
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- Ontology. Its Theory and History from a Philosophical Perspective
- Logic and Ontology entry by Thomas Hofwebwer in the Stanford Encyclopedia of Philosophy
- Free Open access book: Paolo Valore (ed), Topics on General and Formal Ontology.
- International Ontology Congress
- A short film with a general introduction to ontology