 Most moral realists who offer moral theories do not bother to offer anything like a definition of morality. Instead, what these philosophers offer is a theory of the nature and justification of a set of norms with which they take their audience already to be acquainted. In effect, they tacitly pick morality out by reference to certain salient and relative uncontroversial bits of its content: that it prohibits killing, stealing, deceiving, cheating, and so on. In fact, this would not be a bad way of defining morality, if the point of such a definition were only to be relatively theory-neutral, and to allow theorizing to begin. We could call it “the reference-fixing definition” or “the substantive definition” (see Prinz and Nichols 2010: 122).