This article presents an account of sovereignty as a concept that signifies in jural terms the nature and quality of political relations within the modern state. It argues, first, that sovereignty is a politico-legal concept that expresses the autonomous nature of the state’s political power and its specific mode of operation in the form of law and, secondly, that many political scientists and lawyers present a skewed account by confusing sovereignty with governmental competence. After clarifying its meaning, the significance of contemporary governmental change is explained as one that, in certain respects, involves an erosion of sovereignty.