| Term | Definition |
| Free World | made up of countries with non-communist governments |
| the East | the Soviet Union, China, and other communist countries of Eastern Europe and Asia |
| the West | the United States, Great Britain, France, and other democratic nations |
| nonaligned nations | countries remaining neutral in the Cold War |
| arms race | competition between communist and Free World nations (especially Soviet Union and United States) to develop powerful new weapons |
| containment | a policy of political, economic, and military pressure to restrict the spread of communism |
| Iron Curtain | the Soviet Union's tight control over travel and communications between Soviet-dominated Eastern Europe and the Free World |
| limited war | a small scale war without nuclear weapons that involves just one area of the world |
| Space Race | the rivalry between the United States and the Soviet Union for superiority in space exploration and communication |
| satellites | the countries of Eastern Europe that came under the control of the Soviet Union after WWII |
| propaganda | ideas spread by one side in the Cold War to support its own policies or to criticize the other side's actions and beliefs |
| Radio Free Europe | broadcasts supporting democratic principles and ideals transmitted to people living behind the Iron Curtain |
| Peace Corps | American volunteers who help disadvantaged people in underdeveloped countries of the world |
| detente | a time of improved relations between the United States and the Soviet Union during the 1970's |
| peaceful coexistance | the two sides in the Cold War decide to cooperate in such areas as space, trade, education, and science |
| Domino Theory | one country becomes communist, neighbor countries will follow |
| marshall plan | U.S plan to rebuild Europe after WWII |
| cold war | state of tension between communist and democratic countries after WWII |
| Kennan | developed theory of containment |
| Truman Doctrine | A doctrine that promised to aid people struggling to resist threats to democratic freedom. |
| Warsaw Pact | alliance of Easter European communist countries |
| NATO | north atlantic treaty organization |
| Bay of Pigs | CIA trained Cuban exiles to overthrow Castro |