 This method is part of Aristotle’s Platonic legacy. His attitude towards it, however, is complex. He adopts a view of the proper structure of definitions that is closely allied to it: a correct definition of \(X\) should give the genus (genos: kind or family) of \(X\), which tells what kind of thing \(X\) is, and the differentia (diaphora: difference) which uniquely identifies \(X\) within that genus. Something defined in this way is a species (eidos: the term is one of Plato’s terms for “Form”), and the differentia is thus the “difference that makes a species” (eidopoios diaphora, “specific difference”). In Posterior Analytics II.13, he gives his own account of the use of Division in finding definitions.