Definition of runathon in US English:

runathon

(also run-a-thon)

noun

US
informal
  • 1Baseball and Cricket. A match in which an unusually high number of runs are scored.

  • 2An event featuring long-distance or protracted running; especially one undertaken in order to raise money for charity.

Origin

1930s; earliest use found in Bakersfield Californian. From run + -athon.

Pronunciation

runathon

/ˈrʌnəθɒn/