Among the things that are said in many ways, some are called [homonymous] according to a different modality. And some things, which we call “homonymous”, contain the duality in their names, while others, which philosophers call “ambiguous”, in their account. And some things are manifestly homonymous, while others are [sc. merely] ambiguous. For example, knowledge, insofar as [it is proper] of many things, means many things and is ambiguous. In fact, the same and single knowledge is thus [proper of] many things, such as the end and the things [going] towards the end. For instance, the art of building also is a knowledge related to a building, such as [it is a knowledge related to] the end and to the things through which a building comes into being, things that, precisely, are [going] towards the end. Therefore, the same [knowledge belongs to] many things. Similarly, medicine also [belongs to] things productive of health, such as diet, a cut, a burning and many other things.