Circular Definition

For the definition of Circular Definition, see Circular Definition. While this is an obvious joke, it has a certain justification beyond Rule of Funny. This type of definition may illustrate the term and get the meaning across to the reader better than any formal definition in terms of previously defined terms. It is literally impossible to define all terms in terms of previously defined terms.note 


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http://tvtropes.org/pmwiki/pmwiki.php/Main/CircularDefinition