noun / adjective
marathon
MAIR-uh-thahn/mˈɛrʌθˌɑn/
An endurance footrace of 42.195 kilometers.
Two tired runners approach the finish line of the marathon.

Etymology
Marathōn names the town associated with the race’s founding story: a messenger running from the battlefield to Athens with news of victory. The Olympic race adopted this later, less likely version of the story.
In context
42.2 kilometers or 26.2 miles there's a challenge for even the most experienced of Runners running marathon is a big challenge
More examples
- A full marathon covers 42.195 kilometers, or about 26.2 miles.
- She trains for months before running her first marathon.
- The budget debate turns into a marathon meeting.
Forms
marathon · marathons
marathoner noun — A runner who competes in marathons.
Similar words
- race
- A broader term that does not specify the distance.