Definition of marathon adjective from the Oxford Advanced Learner's Dictionary

 

marathon

 adjective
adjective
BrE BrE//ˈmærəθən//
 
; NAmE NAmE//ˈmærəθɑːn//
 
[only before noun]
 
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lasting a long time and requiring a lot of effort and patience a marathon journey lasting 56 hours a marathon legal battle

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