marathon /marˈə-thon, -thən/

1. A long-distance foot-race (usu 26 miles 385 yards, 42.195km), commemorating the tradition that a Greek ran from Marathon to Athens with news of victory after a battle in 490BC
2. A long-distance race in other sports, eg swimming
3. Any long, severe test of endurance

1. Relating to running marathons
2. Of great length in time, distance, etc
3. Displaying powers of endurance and stamina

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