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'Quality' means: |
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(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; |
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(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); |
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(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. |
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(4) Quality in respect of virtue and vice, and in general,
of evil and good. |
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Quality, then, seems to have practically two meanings, and one of
these is the more proper. |
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created 1996/11/25 modified 2009/04/26