The process of ostensive definition itself was critically appraised by Ludwig Wittgenstein. One important form of the extensional definition is "ostensive definition". Early in "The Investigations", Wittgenstein attacks the usefulness of ostensive definition. An ostensive definition conveys the meaning of a term by pointing out examples. This approach has been criticized for its dismissal of the importance of ostensive definitions. Let us first consider a case of ostensive definition in a public language. Another is that "an ostensive definition can be variously interpreted in "every" case". It is an ostensive demonstration of what is meant by "three times". The only "possible" definition is the private, ostensive one of associating S with "that" feeling.