English

Definition of the First World War noun from the Oxford Advanced Learner's Dictionary

 

the First World War

 noun
noun
BrE
 
; NAmE
 
(also World War I) [singular]
 
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the war that was fought mainly in Europe between 1914 and 1918 Culture The war was fought between the Central Powers (Germany, Austria-Hungary and Turkey) and the Allies (Britain, France, Russia, Italy and the US). Most of the fighting took place in Europe, around the borders of Eastern Germany, Poland and Russia, and in north-east France and Belgium, where millions of soldiers died in long battles between armies in trenches (= long narrow holes dug in the ground). For many people these battles represent the essential horror and waste of war. The Germans agreed to stop fighting in 1918, after more than 10 million people had been killed.
See the Oxford Advanced American Dictionary entry: the First World War