‘Concepts and Universals in Aristotle’s Metaphysical Thought’ by Christof Rapp starts with the recognition that Aristotle does not have a general term for ‘concept’ and examines which entities in his metaphysical theory might play the role of concepts. According to Rapp, many of Aristotle’s discussions focus on the meaning of general terms and whether they signify something real and existing independently in its own right. Aristotle remains committed to the view that universals as captured by genuine definitions are crucial for human knowledge and understanding. Insofar as Aristotle resists a conception of universals as existing in the way that particular substances do, he can be taken to intimate that universals are ‘merely conceptual’. In the Metaphysics, he distances himself from the view that universals such as genera and species qualify as substances. His main contribution to our thinking about concepts consists in the view that both universals and embodied substantial forms have mental counterparts, by which we grasp and understand the things falling under the conceived form or essential definition.