1. (noun) any long and arduous undertaking

• endurance contest

2. (noun) a battle in 490 BC in which the Athenians and their allies defeated the Persians

• battle of marathon

1. (noun) any long and arduous undertaking

• labor
• project
• task
• undertaking

2. (noun) a footrace of 26 miles 385 yards

• foot race
• footrace
• run

1. (noun) a footrace of 26 miles 385 yards

• long-distance runner
• marathon runner
• marathoner
• road runner