1. (noun)marathon, endurance contest any long and arduous undertaking Synonyms: battle of Marathon, endurance contest, marathon
2. (noun)marathon a footrace of 26 miles 385 yards Synonyms: battle of Marathon, endurance contest
3. (noun)Marathon, battle of Marathon a battle in 490 BC in which the Athenians and their allies defeated the Persians Synonyms: battle of Marathon, endurance contest