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

World War One

noun
 
/ˌwɜːld ˌwɔː ˈwʌn/
 
/ˌwɜːrld ˌwɔːr ˈwʌn/
(also World War I)
(also the First World War)
[singular]
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  1. the war that was fought mainly in Europe between 1914 and 1918
trait
noun
 
 
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