Edna Andrews clarifies and extends the work of Roman Jakobson to develop a theory of invariants in language by distinguishing between general and contextual meaning in morphology and semantics. Markedness theory, as Jakobson conceived it, is a qualitative theory of oppositional binary relations. Andrews shows how markedness theory enables a linguist to precisely define the systemically given oppositions and hierarchies represented by linguistic categories. In addition, she redefines the relationship between Jakobsonian markedness theory and Peircean interpretants. Though primarily theoret