Predication is widely considered to be a fundamental feature of human language and conceptual structure. This article offers a reassessment of the central role that predication plays within current theories of grammar, by calling into question the universality of predication and its nature as a primitive, irreducible notion. It proposes a new definition of predicate, as a complex emergent entity derived from the alignment of two independent elements of conceptual structure: thematic role assignment and headedness.