marathon Definition in the Cambridge English Dictionary
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Definition of “marathon” - English Dictionary

Definition of "marathon" - American English Dictionary

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marathonnoun [C]

 us   /ˈmær·əˌθɑn/
a ​longrace, ​run on ​roads, of 26.2 ​miles or 42.2 ​kilometers: The New York City marathon ​begins in Staten Island and ​ends in Manhattan’s Central Park. A marathon is also an ​activity that ​continues for a very ​longtime: a ​dance marathon

marathonadjective [not gradable]

 us   /ˈmær·əˌθɑn/
A marathon ​activity is one that ​continues for a very ​longtime: The marathon ​negotiatingsessionlasted all ​night.
(Definition of marathon from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "marathon" - British English Dictionary

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marathonnoun [C]

uk   /ˈmær.ə.θən/  us   /-θɑːn/

marathon noun [C] (RACE)

B2 a ​runningrace 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 ​longtime and makes you very ​tired: The ​electionbroadcast, a nine-hour marathon, ​lasts until seven o'clock in the ​morning.

marathonadjective [before noun]

uk   /ˈmær.ə.θən/  us   /-θɑːn/

marathon adjective [before noun] (RACE)

related to marathons (= ​runningraces): a marathonrunner

marathon adjective [before noun] (LONG TIME)

used to ​describe something that ​takes a very ​longtime and makes you very ​tired: I had a marathon sessionmarking 55 ​testsyesterday.
(Definition of marathon from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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