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English definition of “marathon”

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marathon

noun [C]  /ˈmær·əˌθɑn/ us  
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

marathon

adjective [not gradable]  /ˈmær·əˌθɑn/ us  
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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