Which military conflict is known as "The Great War"?

"The Great War" refers to World War I, which lasted from 1914 to 1918. This designation arose during the conflict and continued to be used before World War II emerged, which subsequently led to the renaming of the first conflict to avoid confusion. World War I was notable for its unprecedented scale of warfare, the introduction of new military technologies, and the significant loss of life, marking it as a pivotal moment in global history. The war involved many of the world's great powers and resulted in substantial geopolitical changes, thereby solidifying its reputation as "The Great War."

The other conflicts listed do not carry this moniker. World War II, which occurred later, became known as the Second World War, while the Korean War and the Vietnam War are distinct military engagements with their own specific historical contexts.