Martin Heidegger (18891976) was one of the most original thinkers of the twentieth century. His work has profoundly influenced philosophers including Jean-Paul Sartre Simone de Beauvoir Maurice Merleau-Ponty Michel Foucault Jacques Derrida Hannah Arendt Hans-Georg Gadamer Jrgen Habermas Charles Taylor Richard Rorty Hubert Dreyfus Stanley Cavell Emmanuel Levinas Alain Badiou and Gilles Deleuze. His accounts of human existence and being and his critique of technology have inspired theorists in fields as diverse as theology anthropology sociology psychology political science and the humanities. This Lexicon provides a comprehensive and accessible guide to Heideggers notoriously obscure vocabulary. Each entry clearly and concisely defines a key term and explores in depth the meaning of each concept explaining how it fits into Heideggers broader philosophical project. With over 220 entries written by the worlds leading Heidegger experts this landmark volume will be indispensable for any student or scholar of Heideggers work.