Definition of marathon noun from the Oxford Advanced American Dictionary

     

    marathon

     noun
    noun
    NAmE//ˈmærəˌθɑn//
     
     
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  1. 1 a long running race of about 26 miles or 42 kilometers the Chicago marathon to run a marathon
  2. 2an activity or a piece of work that lasts a long time and requires a lot of effort and patience The interview was a real marathon. From the story that in ancient Greece a messenger ran from Marathon to Athens (22 miles) with the news of a victory over the Persians.
marathonadjective[only before noun]
 
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a marathon car trip lasting 56 hours a marathon legal battle

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