1. Let us first consider a case of ostensive definition in a public language. 2. It is an ostensive demonstration of what is meant by " three times ". 3. Wittgenstein rejects the idea that ostensive definitions can provide us with the meaning of a word. 4. Early in " The Investigations ", Wittgenstein attacks the usefulness of ostensive definition. 5. All historical proof is ultimately ostensive . 6. So memory scepticism could be applied with equal effect to ostensive definitions given in a public language. 7. Another is that " an ostensive definition can be variously interpreted in " every " case ". 8. They are classes in : human rights, control of civil riots, ostensive policing, crisis management and shooting techniques. 9. Another important category of definitions is the class of ostensive definitions, which convey the meaning of a term by pointing out examples. 10. An everyday ostensive definition is embedded in a public language, and so in the form of life in which that language occurs.