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English definition of “marathon”

marathon

adjective [before noun] (LONG TIME)    /ˈmær.ə.θən/ US  /-θɑːn/
describes something that takes a very long time and makes you very tired: I had a marathon session marking 55 exam papers yesterday.Lasting for a long time
(Definition of marathon adjective (LONG TIME) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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