Marathoned is a term used to describe the act of running a marathon, which is a long-distance running event that typically covers a distance of 26.2 miles. The term is derived from the Greek legend of Pheidippides, who RAN from Marathon to Athens in 490 BC to deliver news of a military victory. The term marathoned is often used to describe someone who has completed a marathon race. The crossword solution for the term marathoned is 'RAN', which is an appropriate description of the action taken by Pheidippides and by those who have completed a marathon race.