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English definition of “marathon”

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marathon

noun [C] uk   /ˈmær.ə.θən/ us    /-θɑːn/

marathon noun [C] (RACE)

B2 a running race of slightly over 26 miles (42.195 kilometres): the London/New York marathon She did/ran her first marathon in just under three hours.
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marathon noun [C] (LONG ACTIVITY)

an activity that takes a long time and makes you very tired: The election broadcast, a nine-hour marathon, lasts until seven o'clock in the morning.

marathon

adjective [before noun] uk   /ˈmær.ə.θən/ us    /-θɑːn/

marathon adjective [before noun] (RACE)

related to marathons (= running races): a marathon runner

marathon adjective [before noun] (LONG TIME)

used to describe something that takes a very long time and makes you very tired: I had a marathon session marking 55 tests yesterday.
(Definition of marathon from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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