Aristotle - The Organon - index for TOPICA Book 1 Part 5

Definition, property, genus, and accident

Paragraph 1 We must now say what are 'definition', 'property', 'genus', and 'accident'.
Paragraph 2 A 'property' is a predicate which does not indicate the essence of a thing, but yet belongs to that thing alone, and is predicated convertibly of it.
Paragraph 3 A 'genus' is what is predicated in the category of essence of a number of things exhibiting differences in kind.
Paragraph 4 An 'accident' is (i) something which, though it is none of the foregoing - i.e. neither a definition nor a property nor a genus yet belongs to the thing:

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