This is the first dictionary dedicated to Quentin Meillassoux and the controversies surrounding his thought. Quentin Meillassoux - described as the fastest-rising French philosopher since Derrida - is one of the most exciting philosophers writing today. Perfect for philosophers just starting with Meillassoux, this dictionary defines all of the major terms of his work, prefaced by an introduction that argues for the importance of this new figure on the Continental philosophy scene. A-Z entries explain the influence of key figures, from Derrida to Heidegger to Kant, and define the complex terms that Meillassoux uses. The entries are written by the top scholars in the field of speculative realism, often highlighting their own disagreements with him. This is not just a dictionary, but an opening onto one of the most lively debates in recent philosophy. It defines Meillassoux's 75 most important concepts and themes, plus the figures he cites, fully cross-referenced. It sets out key criticisms of Meillassoux's work by prominent authors in the field, such as Adrian Johnston and Christopher Norris. It provides clear definitions for readers new to Meillassoux's work. It offers avenues for further specialist research.