What is Hypertext? It has been studied and explored for over 50 years but a complete definition seems ever more elusive. The term is invoked in multiple communities, and applied in radically different domains, but if we cannot reconcile the different perspectives then we will be unable to learn from our shared history, or from each other in the future. In this paper we argue that the longevity and variety of hypertext work makes a simple definition impractical. Instead we suggest different contexts in which hypertext work has been conducted, and then attempt to draw out the relationships and commonalities between them. We describe seven contexts drawn from the literature: Hypertext as a Tool for Thought, as Knowledge Representation, as Soci...