An ostensive definition conveys the meaning of a term by pointing out examples. This type 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 definitio ...

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".

Overview

An ostensive definition assumes the questioner has sufficient understanding to recognize the type of information being given.

Ludwig Wittgenstein Ludwig Josef Johann Wittgenstein ( ; ; 26 April 1889 – 29 April 1951) was an Austrian philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language. From 1929 to 1947, Witt ...

writes:

So one might say: the ostensive definition explains the use—the meaning—of the word when the overall role of the word in language is clear. Thus if I know that someone means to explain a colour-word to me the ostensive definition "That is called 'sepia' " will help me to understand the word.... One has already to know (or be able to do) something in order to be capable of asking a thing's name. But what does one have to know?

The limitations of ostensive definition are exploited in a famous argument from Wittgenstein’s ''

Philosophical Investigations ''Philosophical Investigations'' () is a work by the philosopher Ludwig Wittgenstein, published posthumously in 1953. ''Philosophical Investigations'' is divided into two parts, consisting of what Wittgenstein calls, in the preface, ''Bemer ...

'' (which deal primarily with the

philosophy of language Philosophy of language refers to the philosophical study of the nature of language. It investigates the relationship between language, language users, and the world. Investigations may include inquiry into the nature of Meaning (philosophy), me ...

), the private language argument, in which he asks if it is possible to have a private language that no one else can understand.Wittgenstein, Ludwig. ''Philosophical Investigations'', §258. John Passmore states that the term was first defined by the British logician William Ernest Johnson (1858–1931):

"His neologisms, as rarely happens, have won wide acceptance: such phrases as "ostensive definition", such contrasts as those between ... "determinates" and "determinables", "continuants" and "occurrents", are now familiar in philosophical literature" (Passmore 1966, p. 344.)

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* * * (in particular Sect.11)

Overview

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Further reading