an organization of people (or countries) involved in a pact or treaty

an international organization of independent Arab states formed in 1945 to promote cultural and economic and military and political and social cooperation

an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members

an international organization created in 1949 by the North Atlantic Treaty for purposes of collective security

international organization for chemical disarmament; administers the Chemical Weapons Convention

an association including most countries in the western hemisphere; created in 1948 to promote military and economic and social and cultural cooperation