Ontology (from the Greek Greek , an independent branch of the Indo-European family of languages, is the language of the Greeks. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. In its ancient form, it is the language of classical ancient Greek literature and the New Testament of ὄν, genitive ὄντος: "of being" (neuter participle of εἶναι: "to be") and -λογία, -logia: science, study, theory) is the philosophical Philosophy is the study of general and fundamental problems concerning matters such as existence, knowledge, values, reason, mind, and language. It is distinguished from other ways of addressing fundamental questions by its critical, generally systematic approach and its reliance on rational argument. The word "philosophy" comes from the study of the nature of being Being , is an English word used for conceptualizing subjective aspects fundamental to the self —related to and somewhat interchangeable with terms like "existence" and "living". In its objective usage —as in "a being," or "[a] human being" —it refers to a discrete life form that has properties of mind (, existence In common usage, existence is the world we are aware of through our senses, and that persists independently without them. In academic philosophy the word has a more specialized meaning, being contrasted with essence, which specifies different forms of existence as well as different identity conditions for objects and properties. Philosophers or reality Reality is the state of things as they actually exist, rather than as they may appear or may be thought to be. In its widest definition, reality includes everything that is and has being, whether or not it is observable or comprehensible in general, 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 Metaphysics is a branch of philosophy concerned with explaining the fundamental nature of being and the world although it is not easily defined.. Someone who studies metaphysics would be called either a metaphysicist or a metaphysician, ontology deals with questions concerning what entities An entity is something that has a distinct, separate existence, though it need not be a material existence. In particular, abstractions and legal fictions are usually regarded as entities. In general, there is also no presumption that an entity is animate. Entities are used in system developmental models that display communications and internal exist or can be said to exist, and how such entities can be grouped, related within a hierarchy A hierarchy (Greek: hierarchia , from hierarches, "leader of sacred rites") is an arrangement of items (objects, names, values, categories, etc.) in which the items are represented as being "above," "below," or "at the same level as" one another and with only one "neighbor" above and below each of, and subdivided according to similarities and differences.

Contents

Overview

Ontology concerns determining whether some categories of being are fundamental, and asks in what sense the items in those categories can be said to "be". It is the inquiry into being in so much as it is being, or into beings insofar as they exist—and not insofar as, for instance, particular facts The word fact can refer to verified information about past or present circumstances or events which are presented as objective reality. In science, it means a provable concept. obtained about them or particular properties In metaphysics , the different kinds or ways of being are called categories of being or simply categories. To investigate the categories of being is to determine the most fundamental and the broadest classes of entities. A distinction between such categories, in making the categories or applying them, is called an ontological distinction related to them.

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, and iv) according to its potency, movement (energy) or finished presence (Metaphysics Book Theta Metaphysics is one of the principal works of Aristotle and the first major work of the branch of philosophy with the same name. The principal subject is "being qua being", or being understood as being. It examines what can be asserted about anything that exists just because of its existence and not because of any special qualities it has).

Some philosophers, notably of the Platonic school Platonism is the philosophy of Plato or the name of other philosophical systems considered closely derived from it. In a narrower sense the term might indicate the doctrine of Platonic realism. The central concept of Platonism is the Theory of Forms: the transcendent, perfect archetypes, of which objects in the everyday world are imperfect copies, 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 Object is a technical term used in epistemology, a branch of philosophy concerning itself with the study of knowing. Aristotle had said, "All men by nature desire to know." René Descartes expanded this knowing into the grounds of certainty with cogito ergo sum, typically translated as "I think therefore I am." The thinker or events In philosophy, events are objects in time or instantiations of properties in objects. However, a definite definition has not been reached, as multiple theories exist concerning events. In this latter view, mind Mind is the aspect of intellect and consciousness experienced as combinations of thought, perception, memory, emotion, will and imagination, including all unconscious cognitive processes. The term is often used to refer, by implication, to the thought processes of reason. Mind manifests itself subjectively as a stream of consciousness, instead of referring to an entity, refers to a collection of mental events experienced by a person; society A society or a human society is a group of people related to each other through persistent relations such as social status, roles and social networks. Human societies are characterized by patterns of relationships between individuals sharing a distinctive culture and institutions. Without an article, the term refers either to the entirety of refers to a collection of persons with some shared characteristics, and geometry Geometry "Earth-measuring" is a part of mathematics concerned with questions of size, shape, relative position of figures, and the properties of space. Geometry is one of the oldest sciences. Initially a body of practical knowledge concerning lengths, areas, and volumes, in the 3rd century BC geometry was put into an axiomatic form by refers to a collection of a specific kind of intellectual activity.[1] Between these poles of realism Platonic realism is a philosophical term usually used to refer to the idea of realism regarding the existence of universals after the Greek philosopher Plato , a student of Socrates, and the teacher of Aristotle. As universals were by Plato considered ideal forms this stance is confusingly also called Platonic idealism and nominalism Nominalism is a metaphysical view in philosophy according to which general or abstract terms and predicates exist, while universals or abstract objects, which are sometimes thought to correspond to these terms, do not exist. Thus, there are at least two main versions of nominalism. One version denies the existence of universals—things that can, 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 The electron is a subatomic particle carrying a negative electric charge. It has no known components or substructure, and therefore is believed to be an elementary particle. An electron has a mass that is approximately 1/1836 that of the proton. The intrinsic angular momentum of the electron is a half integer value in units of ħ, which means that, energy In physics, energy is a quantity that is often understood as the ability to perform work. This quantity can be assigned to any particle, object, or system of objects as a consequence of its physical state, contract In law, a contract is a legally binding agreement between two or more parties which, if it contains the elements of a valid legal agreement, is enforceable by law or by binding arbitration. A legally enforceable contract is an exchange of promises with specific legal remedies for breach. These can include compensatory remedy, whereby the, happiness Happiness is a state of mind or feeling characterized by contentment, love, satisfaction, pleasure, or joy. A variety of biological, psychological, religious, and philosophical approaches have striven to define happiness and identify its sources, space Space is the boundless, three-dimensional extent in which objects and events occur and have relative position and direction. Physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of the boundless four-dimensional continuum known as spacetime. In mathematics one examines ', time Time has been defined as the continuum in which events occur in succession from the past to the present and on to the future. Time has also been defined as a one-dimensional quantity used to sequence events, to quantify the durations of events and the intervals between them, and to quantify and measure the motions of objects and other changes, truth Truth can have a variety of meanings, from the state of being the case, being in accord with a particular fact or reality, being in accord with the body of real things, events, actuality, or fidelity to an original or to a standard, truth "behind" everything, the ontological truth. In archaic usage it could be fidelity, constancy or, causality Causality is the relationship between an event and a second event (the effect), where the second event is a consequence of the first, and God God is the English name given to the singular omnipotent being in theistic and deistic religions who is either the sole deity in monotheism, or a single deity in polytheism, 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 Philosophy is the study of general and fundamental problems concerning matters such as existence, knowledge, values, reason, mind, and language. It is distinguished from other ways of addressing fundamental questions by its critical, generally systematic approach and its reliance on rational argument. The word "philosophy" comes from the have provided different answers to these questions.

One common approach is to divide the extant entities 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 Library science is an interdisciplinary field that applies the practices, perspectives, and tools of management, information technology, education, and other areas to libraries; the collection, organization, preservation, and dissemination of information resources; and the political economy of information. The first school for library science was and artificial intelligence Artificial intelligence is the intelligence of machines and the branch of computer science that aims to create it. Textbooks define the field as "the study and design of intelligent agents," where an intelligent agent is a system that perceives its environment and takes actions that maximize its chances of success. John McCarthy, who. Such an understanding of ontological categories, however, is merely taxonomic, classificatory. The categories are, properly speaking,[citation needed] 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:

Concepts

Essential ontological dichotomies A dichotomy is any splitting of a whole into exactly two non-overlapping parts, meaning it is a procedure in which a whole is divided into two parts, or in half. It is a partition of a whole into two parts (subsets) that are: include:

History of ontology

Etymology

While the etymology Etymology is the study of the history of words, their origins, and how their form and meaning have changed over time is Greek, the oldest extant record of the word itself is the 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).

The first occurrence in English of "ontology" as recorded by the OED (Oxford English Dictionary, second edition, 1989) appears in 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 first 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.

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