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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 dictionaries General (24 matching dictionaries)
  1. backup: Oxford Dictionaries [home, info]
  2. backup: American Heritage Dictionary of the English Language [home, info]
  3. backup: Collins English Dictionary [home, info]
  4. backup: Vocabulary.com [home, info]
  5. backup: Macmillan Dictionary [home, info]
  6. backup: Merriam-Webster's Online Dictionary, 11th Edition [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: Dictionary.com [home, info]
  14. backup: UltraLingua English Dictionary [home, info]
  15. backup: Cambridge Dictionary of American English [home, info]
  16. BackUp, Backup (TV series), Backup (backup software), Backup (disambiguation), Backup (software), Backup (tactical): Wikipedia, the Free Encyclopedia [home, info]
  17. backup: Rhymezone [home, info]
  18. backup: Free Dictionary [home, info]
  19. backup: Mnemonic Dictionary [home, info]
  20. backup: WordNet 1.7 Vocabulary Helper [home, info]
  21. backup: LookWAYup Translating Dictionary/Thesaurus [home, info]
  22. backup: Dictionary/thesaurus [home, info]

Art dictionaries Art (1 matching dictionary)
  1. backup: ODLIS: Online Dictionary of Library and Information Science [home, info]

Business dictionaries Business (5 matching dictionaries)
  1. Backup: MoneyGlossary.com [home, info]
  2. Backup: Construction Term Glossary [home, info]
  3. backup: Legal dictionary [home, info]
  4. backup: Financial dictionary [home, info]
  5. backup: BusinessDictionary.com [home, info]

Computing dictionaries Computing (8 matching dictionaries)
  1. backup: Free On-line Dictionary of Computing [home, info]
  2. Backup: CCI Computer [home, info]
  3. Backup: Technology Terms and Acronyms [home, info]
  4. Backup: Tech Terms Computer Dictionary [home, info]
  5. backup: Webopedia [home, info]
  6. Backup: Data Formats and Their Sugggested File Extensions [home, info]
  7. Backup: Technopedia [home, info]
  8. backup: Encyclopedia [home, info]

Medicine dictionaries Medicine (2 matching dictionaries)
  1. backup: online medical dictionary [home, info]
  2. backup: Medical dictionary [home, info]

Miscellaneous dictionaries Miscellaneous (1 matching dictionary)
  1. BACKUP: Acronym Finder [home, info]

Slang dictionaries Slang (3 matching dictionaries)
  1. Backup: Street Terms: Drugs and the Drug Trade [home, info]
  2. backup: The Folk File [home, info]
  3. Backup: Urban Dictionary [home, info]

Sports dictionaries Sports (1 matching dictionary)
  1. backup: Hickok Sports Glossaries [home, info]

Tech dictionaries Tech (1 matching dictionary)
  1. backup: Construction deterioration & building durability glossary [home, info]

Quick definitions from Macmillan (
American English Definition British English Definition

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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)

Phrases that include backup:   backup withholding, backup pumpkin, battery backup, grandfather father son backup, backup college, more...

Words similar to backup:   fill-in, relief, stand-in, substitute, backup man, computer backup, more...

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