An ostensive definition conveys the meaning of a term by pointing out examples. This type of definition is often used where the term is difficult to define verbally, either because the words will not be understood (as with children and new speakers of a language) or because of the nature of the term (such as colors or sensations). It is usually accompanied with a gesture pointing to the object serving as an example, and for this reason is also often referred to as "definition by pointing".
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Ostensive definition in the context of Definition
A definition is a statement of the meaning of a term (a word, phrase, or other set of symbols). Definitions can be classified into two large categories: intensional definitions (which try to give the sense of a term), and extensional definitions (which try to list the objects that a term describes). Another important category of definitions is the class of ostensive definitions, which convey the meaning of a term by pointing out examples. A term may have many different senses and multiple meanings, and thus require multiple definitions.
In mathematics, a definition is used to give a precise meaning to a new term, by describing a condition which unambiguously qualifies what the mathematical term is and is not. Definitions and axioms form the basis on which all of modern mathematics is to be constructed.
Ostensive definition in the context of Organic compound
Organic compounds are a subclass of chemical compounds of carbon. Little consensus exists among chemists on the exact definition of organic compound; the only universally accepted definition is the quasi-tautological "organic compounds are the subject matter of organic chemistry".
Generally, any large chemical compound containing a carbon–hydrogen or carbon–carbon bond is accepted as an organic compound. Thus alkanes (e.g. ethane, CH3−CH3) and their derivatives are typically considered organic. For historical and disciplinary reasons, small molecules containing carbon are generally not accepted: cyanide ion (CN), hydrogen cyanide (HCN), chloroformic acid (ClCO2H), carbon dioxide (CO2), and carbonate ion (CO2−3) may all be excluded.
Ostensive definition in the context of Prague linguistic circle
The Prague school or Prague linguistic circle is a language and literature society. It started in 1926 as a group of linguists, philologists and literary critics in Prague. Its proponents developed methods of structuralist literary analysis and a theory of the standard language and of language cultivation from 1928 to 1939. The linguistic circle was founded in the Café Derby in Prague, which is also where meetings took place during its first years.
The Prague School has had a significant continuing influence on linguistics and semiotics. After the Czechoslovak coup d'état of 1948, the circle was disbanded in 1952, but the Prague School continued as a major force in linguistic functionalism (distinct from the Copenhagen school or English Firthian – later Hallidean – linguistics). The American scholar Dell Hymes cites his 1962 paper "The Ethnography of Speaking" as the formal introduction of Prague functionalism to American linguistic anthropology. The Prague structuralists also had a significant influence on structuralist film theory, especially through the introduction of the ostensive sign.