The United Nations Multilingual Terminology Database (UNTERM) is an online multilingual terminology database which provides United Nations nomenclature, technical or specialized terms and common phrases in all six official UN languages - English, French, Spanish, Russian, Chinese and Arabic. The UNTERM database's link is at: http://unterm.un.org.

The database, daily updated, now with 85,000 entries, is mainly intended for use by the language staff of the UN to ensure accurate and consistent usage in documents published by the Organization. It is now on the Internet to facilitate the efforts of people around the world who participate in the work of the United Nations but do not have access to the Secretariat's intranet. 
Along with the United Nations Depository collection, this is a useful tool.