marathon Meaning in Cambridge American English Dictionary
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Meaning of "marathon" - American English Dictionary

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marathonnoun [C]

 us   /ˈmær·əˌθɑn/
a long race, 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 long time: a dance marathon

marathonadjective [not gradable]

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