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Possible Duplicate:
The same word used to define itself

For example TLA is a three letter acronym; Antepreroxitone (words with the stress on the third from last sylable) is an antepreroxitone; Noun is a noun.

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A word expressing a property which it also possesses itself is said to be autological.

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A word that describes a group of words including itself could be called a self-inclusive word.

Bertrand Russell could not find anything better than member of itself for his famous paradox:

The class of all classes that are not members of themselves, is or is not a member of itself?

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There is a technical mathematical term to describe this situation. It is:

impredicative

which is a definition of an object that presumes the existence of the object in order for the definition to be well-founded. It is related to 'recursive definition' but not identical.

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