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English definition of “marathon”

marathon

noun [C] (RACE)    /ˈmær.ə.θən/ US  /-θɑːn/
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 .Athletics
(Definition of marathon noun (RACE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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