We found 38 dictionaries that define the word IOU:

General (25 matching dictionaries)

1. IOU: Merriam-Webster
2. IOU: Oxford Learner's Dictionaries
3. IOU: American Heritage Dictionary of the English Language
4. IOU: Collins English Dictionary
5. IOU: Vocabulary.com
6. IOU, iou: Wordnik
7. IOU, iou: Cambridge Advanced Learner's Dictionary
8. IOU: Wiktionary
9. IOU: Webster's New World College Dictionary, 4th Ed.
10. IOU: The Wordsmyth English Dictionary-Thesaurus
11. IOU: Infoplease Dictionary
12. IOU, i.o.u: Dictionary.com
13. I.O.U: Online Etymology Dictionary
14. iou: Cambridge Essential American English Dictionary
15. I.O.U, I.O.U. (Freeez song), I.O.U. (Jimmy Dean song), I.O.U. (Lee Greenwood song), I.O.U. (album), IOU (debt), IOU (disambiguation), IOU, I.o.u, Iou: Wikipedia, the Free Encyclopedia
16. Iou: Rhymezone
17. I.O.U, IOU: Stammtisch Beau Fleuve Acronyms
18. I.O.U: Dictionary of Phrase and Fable (1898)
19. iou: FreeDictionary.org
20. iou: Mnemonic Dictionary
21. IOU: TheFreeDictionary.com
22. iou: Longman Dictionary of Contemporary English
23. IOU: Merriam-Webster

Business (6 matching dictionaries)

24. Duhaime's Canadian law dictionary (No longer online)
25. INVESTORWORDS (No longer online)
26. IOU: Accounting Glossary
27. IOU: Investopedia
28. Accounting, Business Studies and Economics Dictionary (No longer online)
29. BusinessDictionary.com (No longer online)

Computing (2 matching dictionaries)

30. IOU: Netlingo
31. SMS Dictionary (No longer online)

Miscellaneous (2 matching dictionaries)

32. IOU: Acronym Finder
33. AbbreviationZ (No longer online)

Slang (1 matching dictionary)

34. IOU, i.o.u: Urban Dictionary

Tech (2 matching dictionaries)

35. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
36. Energy Terms (No longer online)

(Note: See ious as well.)

Definitions from Wiktionary ( ) ▸ noun:  An informal promissory note that is not a negotiable instrument. Similar: nonnegotiable, nonissuer, nonsignatory, nonperson, no-load, noninterest, zero coupon, nonqual, zero-coupon note, verbal note, more... Opposite: debt, repayment, settlement Types: note, bill, bond, promissory note, more... Adjectives: simple, personal, corporate, formal, term, own, political, new, cwm Colors:     indigo,     olive,     umber,     ivory,     ochre, more... ▸ Word origin ▸ Words similar to IOU ▸ Usage examples for IOU ▸ Idioms related to IOU ▸ Wikipedia articles (New!) ▸ Popular adjectives describing IOU ▸ Words that often appear near IOU ▸ Rhymes of IOU ▸ Invented words related to IOU