marathon

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Noun marathon has 3 senses

marathon, endurance contest - any long and arduous undertaking
--₁ is a kind of undertaking, project, task, labor
marathon - a footrace of 26 miles 385 yards
--₂ is a kind of footrace, foot race, run
Marathon, battle of Marathon - a battle in 490 BC in which the Athenians and their allies defeated the Persians
--₃ is a kind of pitched battle