Logicians have identified six rules for constructing a type of definition that is suitable for general purposes.
- A definition should:
- 1.   Include a genus and a differentia.
- 2.   Be neither too broad or too narrow.
- 3.   State the essential attributes of the concept's referents.
- 4.   Avoid circularity.
- 5.   Avoid negative terms.
- 6.   Avoid vague, obscure, and metaphorical language.
Let us examine each of these in turn.
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