marathon Definition

marathon
noun

1. A long-distance race on foot, usually 42.195km (26ml 385yd).

Form: marathon race (sometimes)
2. Any lengthy and difficult task.

adj

1. Belonging or relating to a marathon race.
2. Requiring or displaying great powers of endurance or stamina.

Example: a marathon effort

Etymology: 19c: named after Marathon in Greece, from where a messenger is said to have run to Athens with news of victory over the Persians in 490 bc; the length of the race is based on this distance.