Cornelius Castoriadis (1922-1997) was a Greek-French thinker best known for his work on 'autonomy' and 'human creation'. He was a political activist, psychoanalyst, philosopher, political and social thinker and economist. Recognised as a significant and original thinker of the twentieth century, his work is receiving increased scholarly attention. Notwithstanding the richness of his work, Castoriadis's terminology can prove challenging to understand. Cornelius Castoriadis: Key Concepts is the first book of its kind, providing readers with a road map to the fundamentals of his thought. International specialists in Castoriadis's works introduce and clarify the complexity of his thought through the elucidation of nineteen key concepts that are fundamental to understanding - and grappling with - his ideas. Comprehensive and accessible, the entries have been carefully selected to cover the most central aspects - psychoanalysis, sociology, philosophy, politics - and periods of his thought.