This chapter addresses the questions: what forces a truth-conditional theory of meaning or of content to be circular? And what would a non-circular theory be like? It argues that a non-circular theory of meaning would require a knowledge of the meaning of a sentence or word to include knowledge about how to use that sentence or word; a non-circular theory of content would demand a grasp of a proposition or of one of its constituent concepts to include knowledge about how to frame that proposition or some range of propositions involving that concept and to act on it or them.
Keywords: truth-conditional theory of meaning, content, Frege