Aristotle - The Organon - index for ANALYTICA POSTERIORA Book 2 Part 10

Defining definition

Paragraph 1 Since definition is said to be the statement of a thing's nature, obviously one kind of definition will be a statement of the meaning of the name, or of an equivalent nominal formula.
Paragraph 2 That then is one way of defining definition.
Paragraph 3 We conclude then that definition is (a) an indemonstrable statement of essential nature, or (b) a syllogism of essential nature differing from demonstration in grammatical form, or (c) the conclusion of a demonstration giving essential nature.
Paragraph 4 Our discussion has therefore made plain (1) in what sense and of what things the essential nature is demonstrable, and in what sense and of what things it is not;

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