The first challenge in understanding the courts’ role in unwritten amendments is definitional. “Unwritten amendments” could be understood as overlapping with, but not identical to, amendments to an “unwritten constitution.” Or they could be amendments to the written constitution that leave no trace on the text of the written constitution. In this chapter, the author focuses on the latter in the hopes that it will illuminate the role of the courts. The undeniable reality is that at various times, the Constitution, or various provisions of the Constitution, has been understood in different ways. When those understandings might be considered “unwritten amendments,” however, is not immediately obvious. The author therefore begins by considering several possible definitions of that term she hopes will then help move us toward a more robust understanding of the role of the courts in interpreting, constructing, or participating in “amending” the Constitution.