Definition of "marathon"

marathon

/ˈmæɹəθən/

noun
plural marathons
1. A 42.195 kilometre (26 mile 385 yard) road race.
2. (figuratively, by extension) Any extended or sustained activity.
  Quotations
  After a marathon session that included more than 14 hours of mostly negative public comment, the council agreed 11 to 4 to fund the center, and then gaveled out just before 6 a.m.
  2023 June 10, Patricia Murphy, “OPINION: ‘Atlanta way’ long gone as city leaders face death threats over training center”, in The Atlanta Journal-Constitution
verb
third-person singular simple present marathons, present participle marathoning, simple past and past participle marathoned
1. To run a marathon.
  Quotations
  In less than two years, they and their family and friends have skydived, marathoned, tray-baked and dinner-danced their way to £130,000 for Duchenne research through their help4harry campaign.
  2015 August 1, “‘I was cross that my child had to beg the prime minister for a drug’”, in The Guardian‎
2. (informal, transitive) To watch or read a large number of instalments of (a film, book, TV series, etc.) in one sitting.