 Let us focus on stipulative definitions and reflect on their logic. Some of the important lessons here carry over, as we shall see, to descriptive and explicative definitions. For simplicity, let us consider the case where a single definition stipulatively introduces a term. (Multiple definitions bring notational complexity but raise no new conceptual issues.) Suppose, then, that a language \(L\), the ground language, is expanded through the addition of a new term \(X\) to an expanded language \(L^{+}\), where \(X\) is stipulatively defined by a definition \(\mathcal{D}\) of form (2). What logical rules govern \(\mathcal{D}\)? What requirements must the definition fulfill?