Definitions

1. noun

a long-distance road race, typically 26 miles 385 yards (42.195 kilometers), that is run as a single stage.

“The athlete trained for months to participate in the marathon.”

2. noun

a long and arduous effort or activity.

“The project was a marathon of problem-solving and debugging.”

3. verb

to run or compete in a marathon.

“She decided to marathon the entire course by herself.”