One challenge to advancing space security is the absence of common understandings of frequently used terminology. To facilitate shared understandings of key topics and terms, the United Nations Institute for Disarmament Research (UNIDIR) and Secure World Foundation (SWF) have developed this Lexicon for Outer Space Security.
The Lexicon aims to serve as an accessible global reference point for terminological issues related to space security. To this end, every effort has been made to provide concise and concrete definitions. However, diverging perspectives on key terms are presented in the Lexicon where necessary to reflect different interpretations of space security terminology.
The Lexicon for Space Security is an evolving project. New terminology will be added in the future as the space landscape evolves.