 The topic of this entry is not—at least directly—moral theory; rather, it is the definition of morality. Moral theories are large and complex things; definitions are not. The question of the definition of morality is the question of identifying the target of moral theorizing. Identifying this target enables us to see different moral theories as attempting to capture the very same thing. And it enables psychologists, anthropologists, evolutionary biologists, and other more empirically-oriented theorists to design their experiments or formulate their hypotheses without prejudicing matters too much in terms of the specific content a code, judgment, or norm must have in order to count as distinctively moral.