Usually means: Execution of a planned activity.
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We found 50 dictionaries that define the word operation:

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

Business (5 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. INVESTORWORDS (No longer online)
  3. Operation (disambiguation): Legal dictionary
  4. BusinessDictionary.com (No longer online)
  5. operation: Legal dictionary

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

Medicine (7 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Operation: MedTerms.com Medical Dictionary
  3. Operation: Merck Manuals
  4. online medical dictionary (No longer online)
  5. KidsHealth Glossary of Medical Words (No longer online)
  6. Operation (disambiguation), operation: Medical dictionary
  7. Operation: Drug Medical Dictionary

Miscellaneous (4 matching dictionaries)
  1. Army Technology Glossary (No longer online)
  2. Brilliant Dream Dictionary (No longer online)
  3. A Brief Critical Dictionary of Education (No longer online)
  4. operation: Idioms

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

Slang (1 matching dictionary)
  1. Operation: Urban Dictionary

Tech (2 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. DOD Dictionary of Military Terms (No longer online)

(Note: See operations as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  The method by which a device performs its function.
noun:  The method or practice by which actions are done.
noun:  The act or process of operating; agency; the exertion of power, physical, mechanical, or moral.
noun:  A planned undertaking.
noun:  A business or organization.
noun:  (medicine) A surgical procedure.
noun:  (computing, logic, mathematics) A procedure for generating a value from one or more other values (the operands)
noun:  (mathematics, more formally) a function which maps zero or more (but typically two) operands to a single output value.
noun:  (military) A military campaign (e.g. Operation Desert Storm).
noun:  (obsolete) Effect produced; influence.

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