Abstract

The aim of this article is to characterise the concept of difference in Aristotle, both as a predicate of the genus and as a predicate of the species. We then try to classify these two dimensions of difference within the framework of the predicables. The general conclusion is that the differentia constitutiva is an essential predicate, logically analogous to the genus in this respect, while the differentia divisiva cannot be located within that framework because the predicables are implicitly thought by Aristotle as forms of predication in which the predicate has an extension greater than, or equal to, the subject.