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We found 46 dictionaries with English definitions that include the word backup:
Click on the first link on a line below to go directly to a page where "backup" is defined.

General (24 matching dictionaries)

1. backup: Merriam-Webster.com [home, info]
2. backup: Oxford Learner's Dictionaries [home, info]
3. backup: American Heritage Dictionary of the English Language [home, info]
4. backup: Collins English Dictionary [home, info]
5. backup: Vocabulary.com [home, info]
6. backup: Macmillan Dictionary [home, info]
7. Backup, backup: Wordnik [home, info]
8. backup: Cambridge Advanced Learner's Dictionary [home, info]
9. backup: Wiktionary [home, info]
10. backup: Webster's New World College Dictionary, 4th Ed. [home, info]
11. backup: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. backup: Infoplease Dictionary [home, info]
13. backup: Cambridge Dictionary of American English [home, info]
14. BACKUP (DOS command), Backup (TV series), Backup (disambiguation), Backup (software), Backup: Wikipedia, the Free Encyclopedia [home, info]
15. backup: Rhymezone [home, info]
16. backup: Free Dictionary [home, info]
17. backup: Mnemonic Dictionary [home, info]
18. backup: WordNet 1.7 Vocabulary Helper [home, info]
19. backup: LookWAYup Translating Dictionary/Thesaurus [home, info]
20. backup: Dictionary/thesaurus [home, info]
21. backup: Dictionary.com [home, info]
22. backup: UltraLingua English Dictionary [home, info]

Art (1 matching dictionary)

23. backup: ODLIS: Online Dictionary of Library and Information Science [home, info]

Business (5 matching dictionaries)

24. Backup: MoneyGlossary.com [home, info]
25. Backup: Construction Term Glossary [home, info]
26. backup: Legal dictionary [home, info]
27. backup: Financial dictionary [home, info]
28. backup: BusinessDictionary.com [home, info]

Computing (8 matching dictionaries)

29. backup: Free On-line Dictionary of Computing [home, info]
30. Backup: CCI Computer [home, info]
31. Backup: Technology Terms and Acronyms [home, info]
32. Backup: Tech Terms Computer Dictionary [home, info]
33. backup: Webopedia [home, info]
34. Backup: Data Formats and Their Sugggested File Extensions [home, info]
35. Backup: Technopedia [home, info]
36. backup: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

37. backup: online medical dictionary [home, info]
38. backup: Medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

39. BACKUP: Acronym Finder [home, info]

Slang (3 matching dictionaries)

40. Backup: Street Terms: Drugs and the Drug Trade [home, info]
41. backup: The Folk File [home, info]
42. Backup: Urban Dictionary [home, info]

Sports (1 matching dictionary)

43. backup: Hickok Sports Glossaries [home, info]

Tech (1 matching dictionary)

44. backup: Construction deterioration & building durability glossary [home, info]

(Note: See backups for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (backup) ▸ noun:  (computer science) a copy of a file or directory on a separate storage device ("He made a backup in case the original was accidentally damaged or erased") ▸ noun:  an accumulation caused by clogging or a stoppage ("A traffic backup on the main street") ▸ noun:  the act of providing approval and support ▸ noun:  a subordinate musical part; provides background for more important parts ▸ noun:  someone who takes the place of another (as when things get dangerous or difficult) ▸ Also see backups ▸ Words similar to backup ▸ Usage examples for backup ▸ Idioms related to backup (New!) ▸ Popular adjectives describing backup ▸ Words that often appear near backup ▸ Rhymes of backup ▸ Invented words related to backup