| Term | Definition |
| Prophetic | Able to predict future events. |
| Stalemate | Any unresolved situation in which further action is impossible or useless. |
| Trench | A long narrow ditch used in battle for cover. |
| Reparations | Payments for war damages. |
| Armistice | Agreement to stop fighting until a treaty can be signed. |
| Self Determination | Right of national groups to their own form of government. |
| Propaganda | Ideas, facts, or rumors spread deliberately to further one's cause or damage an opposing cause. |
| Treaty of Versailles | The settlement made with Germany at the end of World War I that called for territorial changes, reparations, and German demilitarization. |
| Fourteen Points | President Wilson's plan based on the Allies' aim to end the war. |
| Treaty of Brest Litovsk | The treaty Russia made with Germany which allowed them to pull out of the war. |
| Bolsheviks | Revolutionary group which took control of the Russian government in 1917. |
| Proletariat | Worker |
| Battle of the Somme | Famous battle on the Western Front where over 1,000,000 lives were lost. |