The war had many catchy alternate names. Obviously it wasn't known as World War I initially as there was no plan for a re-make. It was however referred to as:
In other countries it was referred to as:
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The great war
First world war. Great war.
The great war. world war I. the first world war. The war to end all wars.
World War I was also called 'The Great War'. It was given that name because it involved all of the world's great powers or most influential and important countries.
Until World War II it was known as the 'Great War'.