Usually means: Copy of data for recovery.
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We found 44 dictionaries that define the word backup:

General (22 matching dictionaries)
  1. backup: Merriam-Webster
  2. backup: Oxford Learner's Dictionaries
  3. backup: American Heritage Dictionary of the English Language
  4. backup: Collins English Dictionary
  5. backup: Vocabulary.com
  6. Backup, backup: Wordnik
  7. backup: Cambridge Advanced Learner's Dictionary
  8. backup: Wiktionary
  9. backup: Webster's New World College Dictionary, 4th Ed.
  10. backup: The Wordsmyth English Dictionary-Thesaurus
  11. backup: Infoplease Dictionary
  12. backup: Cambridge Essential American English Dictionary
  13. BACKUP (DOS command), Backup (TV series), Backup (disambiguation), Backup (software), Backup: Wikipedia, the Free Encyclopedia
  14. backup: Rhymezone
  15. backup: FreeDictionary.org
  16. backup: Mnemonic Dictionary
  17. backup: TheFreeDictionary.com
  18. backup: Dictionary.com
  19. backup: Longman Dictionary of Contemporary English
  20. backup: Merriam-Webster

Art (1 matching dictionary)
  1. ODLIS: Online Dictionary of Library and Information Science (No longer online)

Business (5 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. Construction Term Glossary (No longer online)
  3. backup: Legal dictionary
  4. backup: Financial dictionary
  5. BusinessDictionary.com (No longer online)

Computing (8 matching dictionaries)
  1. backup: Free On-line Dictionary of Computing
  2. Backup: CCI Computer
  3. Technology Terms and Acronyms (No longer online)
  4. Backup: Tech Terms Computer Dictionary
  5. Webopedia (No longer online)
  6. Data Formats and Their Sugggested File Extensions (No longer online)
  7. Technopedia (No longer online)
  8. backup: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. backup: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. BACKUP: Acronym Finder

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

Sports (1 matching dictionary)
  1. Hickok Sports Glossaries (No longer online)

Tech (1 matching dictionary)
  1. backup: Construction deterioration & building durability glossary

(Note: See backups as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A reserve or substitute.
noun:  (computing) A copy of a file or record, stored separately from the original, that can be used to recover the original if it is damaged or destroyed.
noun:  An accumulation of material caused by a (partial) obstruction or (complete) blockage of the flow or movement of the material, or an accumulation of material that causes an overflow due to the flow being greater than the maximum possible flow.
noun:  (law enforcement) Reinforcements.
noun:  Any support or extra help.
noun:  (music) Accompaniment.
noun:  Corroboration.
adjective:  Standby, reserve or extra.
adjective:  (computing) That is intended as a backup.
adjective:  Supporting, reinforcing; (music) of or related to accompaniment
verb:  (computing, nonstandard) Alternative form of back up [(idiomatic, intransitive) To move backwards, especially for a vehicle to do so.]

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