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We found 53 dictionaries with English definitions that include the word operation:
Click on the first link on a line below to go directly to a page where "operation" is defined.

General dictionaries General (30 matching dictionaries)
  1. operation: Merriam-Webster.com [home, info]
  2. Operation, operation: Oxford Learner's Dictionaries [home, info]
  3. operation: American Heritage Dictionary of the English Language [home, info]
  4. operation: Collins English Dictionary [home, info]
  5. operation: Vocabulary.com [home, info]
  6. operation: Macmillan Dictionary [home, info]
  7. Operation, operation: Wordnik [home, info]
  8. operation: Cambridge Advanced Learner's Dictionary [home, info]
  9. operation: Wiktionary [home, info]
  10. operation: Webster's New World College Dictionary, 4th Ed. [home, info]
  11. operation: The Wordsmyth English Dictionary-Thesaurus [home, info]
  12. operation: Infoplease Dictionary [home, info]
  13. operation: Dictionary.com [home, info]
  14. operation: Online Etymology Dictionary [home, info]
  15. Operation, operation: UltraLingua English Dictionary [home, info]
  16. operation: Cambridge Dictionary of American English [home, info]
  17. Operation (board game), Operation (game), Operation (mathematics), Operation (military), Operation, The Operation (TV film): Wikipedia, the Free Encyclopedia [home, info]
  18. Operation: Online Plain Text English Dictionary [home, info]
  19. operation: Webster's Revised Unabridged, 1913 Edition [home, info]
  20. operation: Rhymezone [home, info]
  21. Operation (f), operation: AllWords.com Multi-Lingual Dictionary [home, info]
  22. operation: Webster's 1828 Dictionary [home, info]
  23. operation: Free Dictionary [home, info]
  24. operation: Mnemonic Dictionary [home, info]
  25. operation: WordNet 1.7 Vocabulary Helper [home, info]
  26. operation: LookWAYup Translating Dictionary/Thesaurus [home, info]
  27. operation: Dictionary/thesaurus [home, info]
  28. operation: Wikimedia Commons US English Pronunciations [home, info]

Business dictionaries Business (5 matching dictionaries)
  1. Operation: MoneyGlossary.com [home, info]
  2. operation: INVESTORWORDS [home, info]
  3. Operation (disambiguation): Legal dictionary [home, info]
  4. operation: BusinessDictionary.com [home, info]
  5. operation: Legal dictionary [home, info]

Computing dictionaries Computing (2 matching dictionaries)
  1. Operation: Cybernetics and Systems [home, info]
  2. Operation (disambiguation), Operation (mathematics), operation: Encyclopedia [home, info]

Medicine dictionaries Medicine (6 matching dictionaries)
  1. Operation: MedTerms.com Medical Dictionary [home, info]
  2. Operation: Merck Manuals [home, info]
  3. operation: online medical dictionary [home, info]
  4. Operation: KidsHealth Glossary of Medical Words [home, info]
  5. Operation (disambiguation), operation: Medical dictionary [home, info]
  6. Operation: Drug Medical Dictionary [home, info]

Miscellaneous dictionaries Miscellaneous (4 matching dictionaries)
  1. Operation: Army Technology Glossary [home, info]
  2. Operation: Brilliant Dream Dictionary [home, info]
  3. operation: A Brief Critical Dictionary of Education [home, info]
  4. operation: Idioms [home, info]

Science dictionaries Science (3 matching dictionaries)
  1. Operation: Eric Weisstein's World of Mathematics [home, info]
  2. operation: MATH SPOKEN HERE! [home, info]
  3. operation: PlanetMath Encyclopedia [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. Operation: Urban Dictionary [home, info]

Tech dictionaries Tech (2 matching dictionaries)
  1. Operation: AUTOMOTIVE TERMS [home, info]
  2. operation: DOD Dictionary of Military Terms [home, info]

(Note: See operations for more definitions.)

Quick definitions from Macmillan (
American English Definition British English Definition

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Quick definitions from WordNet (operation)

noun:  the activity of operating something (a machine or business etc.) ("Her smooth operation of the vehicle gave us a surprisingly comfortable ride")
noun:  a planned activity involving many people performing various actions ("They organized a rescue operation")
noun:  a process or series of acts especially of a practical or mechanical nature involved in a particular form of work ("The operations in building a house")
noun:  a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body ("They will schedule the operation as soon as an operating room is available")
noun:  activity by a military or naval force (as a maneuver or campaign) ("It was a joint operation of the navy and air force")
noun:  a business especially one run on a large scale ("A large-scale farming operation")
noun:  (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction) ("It can perform millions of operations per second")
noun:  process or manner of functioning or operating ("The power of its engine determine its operation")
noun:  the state of being in effect or being operative ("That rule is no longer in operation")
noun:  (mathematics) calculation by mathematical methods ("They were learning the basic operations of arithmetic")
noun:  (psychology) the performance of some composite cognitive activity; an operation that affects mental contents ("The cognitive operation of remembering")

▸ Also see operations
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Phrases that include operation:   logical operation, amphibious operation, logic operation, sex change operation, asynchronous operation, more...

Words similar to operation:   act, functioning, performance, procedure, process, surgery, cognitive operation, cognitive process, mathematical operation, mathematical process, surgical operation, surgical procedure, use, more...

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