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We found 38 dictionaries with English definitions that include the word marathon:
Click on the first link on a line below to go directly to a page where "marathon" is defined.

General (28 matching dictionaries)

1. marathon, Marathon: UltraLingua English Dictionary [home, info]
2. Marathon: Dictionary/thesaurus [home, info]
3. marathon, Marathon: LookWAYup Translating Dictionary/Thesaurus [home, info]
4. marathon: WordNet 1.7 Vocabulary Helper [home, info]
5. marathon: Mnemonic Dictionary [home, info]
6. marathon: Free Dictionary [home, info]
7. Marathon: 1911 edition of the Encyclopedia Britannica [home, info]
8. Marathon: Encarta® Online Encyclopedia, North American Edition [home, info]
9. marathon (m), marathon (de), marathon: AllWords.com Multi-Lingual Dictionary [home, info]
10. marathon: Rhymezone [home, info]
11. The Marathon (mixtape), The Marathon (film), Marathon, Marathon (video game), Marathon (television), Marathon (sport), Marathon (media), Marathon (disambiguation), Marathon (computer game series), Marathon (chocolate bar), Marathon (automobile), Marathon (The Flash), Marathon (Santana album), Marathon (Saga album), Marathon (Rush song): Wikipedia, the Free Encyclopedia [home, info]
12. marathon: Cambridge Dictionary of American English [home, info]
13. marathon: Online Etymology Dictionary [home, info]
14. marathon: Dictionary.com [home, info]
15. marathon: Infoplease Dictionary [home, info]
16. marathon, Marathon: The Wordsmyth English Dictionary-Thesaurus [home, info]
17. marathon: Webster's New World College Dictionary, 4th Ed. [home, info]
18. marathon, Marathon: Wiktionary [home, info]
19. marathon: Cambridge Advanced Learner's Dictionary [home, info]
20. marathon, Marathon: Wordnik [home, info]
21. marathon: Macmillan Dictionary [home, info]
22. marathon, Marathon: Vocabulary.com [home, info]
23. marathon: Collins English Dictionary [home, info]
24. marathon, Marathon: American Heritage Dictionary of the English Language [home, info]
25. marathon: Oxford Dictionaries [home, info]
26. marathon, Marathon: Merriam-Webster.com [home, info]

Art (1 matching dictionary)

27. Marathon: Global Glossary [home, info]

Business (2 matching dictionaries)

28. marathon, Marathon (sports), Marathon (sport), Marathon (race): Legal dictionary [home, info]
29. marathon: Travel Industry Dictionary [home, info]

Computing (1 matching dictionary)

30. marathon, Marathon (sports), Marathon (sport), Marathon (race): Encyclopedia [home, info]

Medicine (1 matching dictionary)

31. marathon, Marathon (sports), Marathon (sport), Marathon (race): Medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

32. marathon: A Word A Day [home, info]

Science (2 matching dictionaries)

33. marathon: How Many? A Dictionary of Units of Measurement [home, info]
34. Marathon: Archaeology Wordsmith [home, info]

Slang (1 matching dictionary)

35. marathon: Urban Dictionary [home, info]

Sports (1 matching dictionary)

36. Marathon: Sports Definitions [home, info]

(Note: See marathons for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (marathon) ▸ noun:  any long and arduous undertaking ▸ noun:  a battle in 490 BC in which the Athenians and their allies defeated the Persians ▸ noun:  a footrace of 26 miles 385 yards ▸ Also see marathons ▸ Word origin ▸ Words similar to marathon ▸ Usage examples for marathon ▸ Popular adjectives describing marathon ▸ Words that often appear near marathon ▸ Rhymes of marathon ▸ Invented words related to marathon