 In Ζ.10 and 11, Aristotle returns to the consideration of essence and definition left off in Ζ.6, but now within the hylomorphic context developed in Ζ.7–9. The main question these chapters consider is whether the definition of x ever includes a reference to the matter of x. If some definitions include a reference to matter, then the link between essence and form would seem to be weakened.