Stephen Schiffer

There are two things we must know in order to know what vagueness is. We must know what kinds of things can be vague. Evidently, predicate and sentence types can be vague, but what about tokens of those types? What about statements and other speech acts? What about abstract entities such as properties and propositions? And what about names and the boundaries of physical objects? Then, of course, for each kind of thing that can be vague, we must know in what vagueness for that kind consists. Needless to say, that there are these two questions doesn’t mean that we should try to answer the first before trying to answer the second.

In The Things We Mean I argue that there exist such things as the things we mean and believe, and that they are what I call pleonastic propositions. The first two chapters offer an initial motivation and articulation of the theory of pleonastic propositions, and of pleonastic entities generally. The remaining six chapters bring that theory to bear on issues in the theory of content: the existence and nature of meanings; knowledge of meaning; the meaning relation and compositional semantics; the relation between content-involving facts and underlying physical facts; vagueness and indeterminacy; conditionals; normative discourse; and the role of propositional content in explanation, prediction, and knowledge acquisition.

This chapter focuses on a question: how does the intentionality of language 'derive' from the original intentionality of thought. Hardly any philosopher of language would deny that if something is an expression which has meaning in a population, then that is by virtue of facts about the linguistic behavior and psychological states of members of that population. The chapter starts with a reconstruction of Lewis's account of the relation in Convention because a problem that immediately arises for that account provides a natural segue to the more ambitious Intention‐Based Semantics (IBS) project. IBS is a program for reducing all questions about the intentionality of speech acts and linguistic expressions to questions about the intentionality of thought. It takes as foundational in the theory of meaning a certain notion of speaker‐meaning and seeks to define it, without recourse to any semantic notions, in terms of acting with certain audience‐directed intentions.

In The Things We Mean I argue that there exist such things as the things we mean and believe, and that they are what I call pleonastic propositions. The first two chapters offer an initial motivation and articulation of the theory of pleonastic propositions, and of pleonastic entities generally. The remaining six chapters bring that theory to bear on issues in the theory of content: the existence and nature of meanings; knowledge of meaning; the meaning relation and compositional semantics; the relation between content-involving facts and underlying physical facts; vagueness and indeterminacy; conditionals; normative discourse; and the role of propositional content in explanation, prediction, and knowledge acquisition.