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Thesaurus: marathon

any long and arduous undertaking

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  1. n. any long and arduous undertaking
  2. n. a footrace of 26 miles 385 yards
  3. n:100 n. any long and arduous undertaking n. a footrace of 26 miles 385 yards n. a battle in 490 BC in which the Athenians and their allies defeated the Persians