The reference work contains definitions of concepts of international security and peace. It is oriented towards the current state of research, which distinguishes it from the usual keyword collections in traditional and electronic dictionaries. With some 800 terms and over 1000 definitions and associated explanations, readers are provided with a tool to make scientific working definitions easily accessible. On the other hand, the dictionary is intended to give practitioners the possibility to quickly access scientific terms. Helpful for scientific research and practitioners alike are the approximately 5000 cross-references to other terms as well as the comprehensive literature references. This book is aimed primarily at teachers and students of political science as well as researchers and practitioners in politics, administration and journalism.