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We found 39 dictionaries with English definitions that include the word undo:
Click on the first link on a line below to go directly to a page where "undo" is defined.

General (29 matching dictionaries)

1. undo: Merriam-Webster.com [home, info]
2. undo: Oxford Dictionaries [home, info]
3. undo: American Heritage Dictionary of the English Language [home, info]
4. undo: Collins English Dictionary [home, info]
5. undo: Vocabulary.com [home, info]
6. undo: Macmillan Dictionary [home, info]
7. Undo, undo: Wordnik [home, info]
8. undo: Cambridge Advanced Learner's Dictionary [home, info]
9. undo: Wiktionary [home, info]
10. undo: Webster's New World College Dictionary, 4th Ed. [home, info]
11. undo: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. undo: Infoplease Dictionary [home, info]
13. undo: Dictionary.com [home, info]
14. undo: Online Etymology Dictionary [home, info]
15. undo: UltraLingua English Dictionary [home, info]
16. undo: Cambridge Dictionary of American English [home, info]
17. Undo (Rush of Fools song), Undo (Sanna Nielsen song), Undo: Wikipedia, the Free Encyclopedia [home, info]
18. Undo: Online Plain Text English Dictionary [home, info]
19. undo: Webster's Revised Unabridged, 1913 Edition [home, info]
20. undo: Rhymezone [home, info]
21. undo: AllWords.com Multi-Lingual Dictionary [home, info]
22. undo: Webster's 1828 Dictionary [home, info]
23. undo: Free Dictionary [home, info]
24. undo: Mnemonic Dictionary [home, info]
25. undo: WordNet 1.7 Vocabulary Helper [home, info]
26. undo: LookWAYup Translating Dictionary/Thesaurus [home, info]
27. undo: Dictionary/thesaurus [home, info]

Business (2 matching dictionaries)

28. Undo: MoneyGlossary.com [home, info]
29. undo: Legal dictionary [home, info]

Computing (3 matching dictionaries)

30. undo: CCI Computer [home, info]
31. undo: Webopedia [home, info]
32. undo: Encyclopedia [home, info]

Medicine (1 matching dictionary)

33. undo: Medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

34. undo: Sound-Alike Words [home, info]

Slang (1 matching dictionary)

35. Undo: Urban Dictionary [home, info]

Tech (2 matching dictionaries)

36. Undo: Glossary of video terms [home, info]
37. Undo: Sweetwater Music [home, info]

(Note: See undos for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (undo) ▸ verb:  cause the ruin or downfall of ▸ verb:  cancel, annul, or reverse an action or its effect ("I wish I could undo my actions") ▸ verb:  remove the outer cover or wrapping of ("Undo the parcel") ▸ verb:  cause to become loose ("Undo the shoelace") ▸ verb:  deprive of certain characteristics ▸ Also see undos ▸ Word origin ▸ Words similar to undo ▸ Usage examples for undo ▸ Words that often appear near undo ▸ Rhymes of undo ▸ Invented words related to undo