Marathoner (noun)

1. A person who participates in marathons, either as a runner or a walker.
2. A person who has completed multiple marathons and is experienced in long-distance running.

Origin:

The word marathoner is derived from the word "marathon" and refers to a person who participates in marathons.

Examples:

1. The marathoner trained for months to prepare for the race, logging many miles on the roads.
2. The marathoner's goal was to beat her personal best time in the 26.2-mile race.
3. The marathoner was one of the elite runners in the race, known for his speed and endurance.
4. The marathoner had completed ten marathons and was a seasoned veteran of the sport.
5. The marathoner crossed the finish line, exhausted but exhilarated, to the cheers of the crowd.