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Aristotle - index for METAPHYSICA Book 5 Part 14

Quality

  
Paragraph 1 'Quality' means:
Paragraph 2 (1) the differentia of the essence, e.g. man is an animal of a certain quality because he is two-footed, and the horse is so because it is four-footed;
Paragraph 3 (2) there is another sense in which it applies to the unmovable objects of mathematics, the sense in which the numbers have a certain quality, e.g. the composite numbers which are not in one dimension only, but of which the plane and the solid are copies (these are those which have two or three factors);
Paragraph 4 (3) All the modifications of substances that move (e.g. heat and cold, whiteness and blackness, heaviness and lightness, and the others of the sort) in virtue of which, when they change, bodies are said to alter.
Paragraph 5 (4) Quality in respect of virtue and vice, and in general, of evil and good.
Paragraph 6 Quality, then, seems to have practically two meanings, and one of these is the more proper.


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