The act of running a marathon

plural of marathon

To run a marathon. / (informal, transitive) To watch or read a large number of instalments of (a film, book, TV series, etc.) in one sitting.

A town in Attica, Greece, the site of the victory in 490 BC of heavily outnumbered Athenians against Persians.

A 42.195 kilometre (26 mile 385 yard) road race. / (figuratively, by extension) Any extended or sustained activity.

plural of marathoner

Someone who participates in a marathon or other long-distance races.

simple past tense and past participle of marathon

Involving hard, sustained effort.

plural of half marathon