Ultramarathon definitions

ultramarathon

(from the article `marathon`) ...also won premiere events and set records at the distance. By the late 20th century, road racing, and marathon running in particular, had grown to ...
Found on http://www.britannica.com/eb/a-z/u/4

---

ultramarathon

any footrace of 50 or more miles.
Found on https://www.infoplease.com/dictionary/ultramarathon

---