Language was at the heart of philosophical inquiry for Plato and Aristotle, and in contemporary discussion it is no less central. In addition to the history of philosophy's extensive investigations of language, analytic and continental philosophy too have focused intensively on the matter. But since most inquiries into language remain enclosed in their own methodology, terminology, and tradition, the multiplicity of approaches is often accompanied by their mutual isolation. This book shows that these traditions can, however, speak meaningfully to each other on language: rather than preventing dialogue, their differences provide opportunities for fruitful inquiry. The essays in this volume each treat a central topic in the contemporary study of language. Part One addresses how expression determines thought according to Humboldt, the use of paraphrase in Quine's semantic ascent, and the non-ambiguity of the Frege-Russell senses of ‘is.’ Part Two includes treatments of the possibility and impossibility of promising in Nietzsche, and Derrida's re-working of Saussure's distinction between language and world. Topics in Part Three include the origin and end of language for Heidegger and Foucault, and the mutual sharpening of logic and ordinary speech in Anselm. This book fills a gap in current scholarship by bringing together nine essays that, through rejecting the debilitating yet often unquestioned divisions between disciplines, are able to illuminate the fundamental nature of language.