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English definition of “marathon”

marathon

noun [C]    /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
(Definition of marathon noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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