The fields of semantics and pragmatics are devoted to the study of conventionalized and context--or use--dependent aspects of natural language meaning, respectively. The complexity of human language as a semiotic system has led to considerable debate about how the semantics/pragmatics distinction should be drawn, if at all. This debate largely reflects contrasting views of meaning as a property of linguistic expressions versus something that speakers do. The fact that both views of meaning are essential to a complete understanding of language has led to a variety of efforts over the last 40 years to develop better integrated and more comprehensive theories of language use and interpretation. The most important advances have included the adaptation of propositional analyses of declarative sentences to interrogative, imperative and exclamative forms; the emergence of dynamic, game theoretic, and multi--dimensional theories of meaning; and the development of various techniques for incorporating context--dependent aspects of content into representations of context--invariant content with the goal of handling phenomena such as vagueness resolution, metaphor, and metonymy.The fields of semantics and pragmatics are devoted to the study of the semiotics of language. The fact that two separate disciplines have developed for this purpose reflects the complexity of human language as a semiotic system, as well as the debate as to how it should be analyzed. This complexity is of at least four types. First, we use language not only to represent information (or thought) to ourselves and convey it to others, but also to act on and interact with others in ways that do not directly have to do with the transmission of information, such as greetings, exclamations or orders 1,2 . Second, language is simultaneously highly systematic and flexible. On the one hand, interlocutors are under strong pressure to be consistent in their use of language to transmit messages; otherwise, communication would be more difficult and less reliable than it is. On the other, they continually innovate in using existing linguistic forms to convey new, and sometimes even radically different, messages via metaphor 3 , irony 4 , and other devices 5 . Third, even if we assume a certain stability in the relation between linguistic form and what is communicated, the immediate context of use is Related Articles Article ID Article title COGSCI--086 Lexical Semantics COGSCI--106 Semantics, Acquisition of COGSCI--201 Discourse Processing