Why is it called World War I?

Twalli
Bot in terms of countries involved, death toll, and landmass fought on World War 1 is smaller than previous wars. Why doe it get that title when other wars did not get World War that encompassed more of the world? Because of this I never call it World War 1 since it seems to be a misnomer. A better name, is the name used during and immediately after it The Great War. It was also called The War to End All Wars, but that obviously didn't happen.
Why is it called World War I?
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