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Reference is a relation between objects in which one object designates, or acts as a means by which to connect to or link to, another object. The first object in this relation is said to refer to the second object. The second object—the one to which the first object refers—is called the referent of the first object.
References can take on many forms, including: a thought, a sensory perception that is audible (onomatopoeia), visual (text), olfactory, or tactile, emotional state, relationship with other, spacetime coordinate, symbolic or alpha-numeric, a physical object or an energy projection. In some cases methods are used that intentionally hide the reference from some observers, as in cryptography.
References feature in many spheres of human activity and knowledge, and the term adopts shades of meaning particular to the contexts in which it is used. Some of these are described in the sections below.
Etymology and meanings
The word reference is derived from Middle English referren, from Middle French référer, from Latin referre, "to carry back", formed from the prefix re- and ferre, "to bear". A number of words derive from the same root, including refer, referee, referential, referent, referendum.
The verb refer (to) and its derivatives may carry the sense of "link to" or "connect to", as in the meanings of reference described in this article. Another sense is "consult"; this is reflected in such expressions as reference work, reference desk, job reference, etc.
In semantics, reference is generally construed as the relationships between nouns or pronouns and objects that are named by them. Hence, the word "John" refers to the person John. The word "it" refers to some previously specified object. The object referred to is called the referent of the word. Sometimes the word-object relation is called "denotation"; the word denotes the object. The converse relation, the relation from object to word, is called "exemplification"; the object exemplifies what the word denotes. In syntactic analysis, if a word refers to a previous word, the previous word is called the "antecedent".
Gottlob Frege argued that reference cannot be treated as identical with meaning: "Hesperus" (an ancient Greek name for the evening star) and "Phosphorus" (an ancient Greek name for the morning star) both refer to Venus, but the astronomical fact that '"Hesperus" is "Phosphorus"' can still be informative, even if the "meanings" of "Hesperus" and "Phosphorus" are already known. This problem led Frege to distinguish between the sense and reference of a word. Some cases seem to be too complicated to be classified within this framework; the acceptance of the notion of secondary reference may be necessary to fill the gap. See also Opaque context.
Words can often be meaningful without having a concrete here-and-now referent. Fictional and mythological names such as "Bo-Peep" and "Hercules" illustrate this possibility. Sign links with absent referents also allow for discussing abstract ideas ("love," "peace") as well as people and events of the past and future.
For those who argue that one cannot directly experience the divine (e.g. God), the sign "God" can serve as an example of a reference with an absent referent. Additionally, certain sects of Judaism and other religions consider it sinful to write, discard, or deface the name of the divine. To avoid this problem, the signifier G-d is sometimes used, though this could be seen as a sign that refers to another sign with an absent referent.
The very concept of the linguistic sign is the combination of content and expression, the former of which may refer entities in the world or refer more abstract concepts, e.g. thought. Certain parts of speech exist only to express reference, namely anaphora such as pronouns. The subset of reflexives expresses co-reference of two participants in a sentence. These could be the agent (actor) and patient (acted on), as in "The man washed himself", the theme and recipient, as in "I showed Mary to herself", or various other possible combinations.
In computer science, references are data types that refer to an object elsewhere in memory and are used to construct a wide variety of data structures, such as linked lists. Generally, a reference is a value that enables a program to directly access the particular data item. Most programming languages support some form of reference. For the specific type of reference used in the C++ language, see reference (C++).
Library and information sciences
References to many types of printed matter may come in an electronic or machine-readable form. For books, there exists the ISBN and for journal articles, the Digital object identifier (DOI) is gaining relevance. Information on the Internet may be referred to by a Uniform Resource Identifier (URI).
In terms of mental processing, a self-reference is used in psychology to establish identification with a mental state during self-analysis. This seeks to allow the individual to develop own frames of reference in a greater state of immediate awareness. However, it can laso lead to circular reasoning, preventing evolution of thought.
In academics and scholarship, an author-title-date information in bibliographies and footnotes, specifying complete works of other people. Copying of material by another author without proper citation or without required permissions is plagiarism.
Keeping a diary allows an individual to use references for personal organization, whether or not anyone else understands the systems of reference used. However, scholars have studied methods of reference because of their key role in communication and co-operation between different people, and also because of misunderstandings that can arise. Modern academic study of reference has been developing since the 19th century.
In scholarship, a reference may be a citation of a text that has been used in the creation of a piece of work such as an essay, report, or oration. Its primary purpose is to allow people who read such work to examine the author's sources, either for validity or to learn more about the subject. Such items are often listed at the end of an article or book in a section marked "Bibliography" or "References". A bibliographical section often contains works not cited by the author, but used as background reading or listed as potentially useful to the reader. A reference section contains all of the works and only those works cited by the author(s) in the main text.
In patent law, a reference is a document that can be used to show the state of knowledge at a given time and that therefore may make a claimed invention obvious or anticipated. Examples of references are patents of any country, magazine articles, Ph.D. theses that are indexed and thus accessible to those interested in finding information about the subject matter, and to some extent Internet material that is similarly accessible.
In art, a reference is an item from which a work is based. This may include:
- an existing artwork,
- a reproduction (i.e., photo),
- directly observed object (i.e., person), or
- the artist's memory.
Another example of reference is samples of various musical works being incorporated into a new one.
- Treanor, Brian, Aspects of alterity: Levinas, Marcel, and the contemporary debate, Fordham University Press, 2006, p.41
- Klein, Ernest, A comprehensive etymological dictionary of the English language, Vol II, Elsevier publishing company, Amsterdam, 1969, p.1317
- Saeed, John, Semantics, Blackwell, p. 12, ISBN 0-631-22693-1
- Engle, Eric, Lex Naturalis, Ius Naturalis: Law as Positive Reasoning & Natural Rationality, The Rlias Clark Group, Melbourne, 2010, p.75
- Reimer, Marga (2009). "Reference". Stanford Encyclopedia of Philosophy
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