Martin Heidegger’s thinking is a complex, and his terminology is as nuanced, as any thinker in the history of philosophy. As the historian of philosophy par excellence, he also exhibits both a greater appreciation and mastery of previous thinkers than any almost any other philosopher before or since. The Historical Dictionary of Heidegger's Philosophy, Third Edition addresses this dual challenge of reading, understanding, and interpreting Heidegger’s vast writings. The book provides a comprehensive and detailed account of the key terms shaping Heidegger’s philosophy, as well as outlining the development of his thought spanning the entirety of his career spanning almost sixty years. The Dictionary also includes a discussion of Heidegger’s seminal writings, the spanning his entire Gesamtausgabe (Complete Edition) up through volume 99 (of the projected 102 volumes).