| Term | Definition |
| Benelux | The first major interstate cooperation. |
| Common Market | Also called the European Economic Community (EEC). |
| cultural organization | An organization based on culture. |
| European Community | An economic union in Europe. |
| European Union | A union that included Germany, France, the United Kingdom, Italy, Spain, Portugal, Greece, the Netherlands, Belgium, Luxembourg, Denmark and Ireland. |
| Euroregions | Transboundary cooperation zones in Europe that conform to the rules of the Euregion Council. The first self-designed one was established along the Dutch-German border in the early 1960s, and the number of these have expanded significantly over the past two decades. |
| Exclusive Economic Zone (EEZ) | An oceanic zone extending up to 200 nautical miles from a shoreline, within which the coastal state can control fishing, mineral exploration, and additional activities by all other countries. |
| international sanctions | Isolate a country that behaves in a way that is deemed inappropriate by the international community. |
| law of the sea | The United Nations Convention on UNCLOS, signed by 157 states (but not including the United States) in 1982; established states' rights and responsibilities concerning the ownership and use of the Earth's seas and oceans and their resources. |
| median-line principle | The system of drawing a poloitical boundary midway between two states' coastlines when the territorial seas or EEZ are narrower that twice the standard or adopted limit. |
| military alliance | Like the North Atlantic Treaty Organization (NATO). |
| multinational union | When states join together to further their shared political ideologies, economic objectives, and strategic goals. |
| political union | An organization that is only political. |
| supranationalism | Refers to efforts by three or more states to forge associations for mutual benefit and in pursuit of shared goals. |
| territorial sea | Zone of seawater adjacent to a country's coast, held to be part of the national territory and treated as a segment of the state itself. |
| Truman Proclamation | In September 1945, the president this was named after proclaimed that the United States would regulate fisheries' activities in areas of the high seas adjacent to its coastline, and that U.S. jurisdiction over the continental shelf and its contents would be limited to the region within the 600-foot isobath. |