This document discusses the importance of definitions and how they can be arguments that define concepts. It notes that definitions have the power to include or exclude things and shape understanding. The document outlines different types of definitions, such as formal definitions that classify things and operational definitions that describe what something does. It advises developing definitional arguments by formulating a claim, finding reasons to support it using a general definition, and considering alternative views. Definitional arguments should also include evidence and address implications. For academic writing, it recommends including a narrative introduction and considering audience and challenges to the argument.