Usually means: Execution of a planned activity.
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We found 52 dictionaries that define the word operation:

General (27 matching dictionaries)
  1. operation: Longman Dictionary of Contemporary English
  2. operation: Merriam-Webster
  3. Operation, operation: Oxford Learner's Dictionaries
  4. operation: American Heritage Dictionary of the English Language
  5. operation: Collins English Dictionary
  6. operation: Vocabulary.com
  7. Operation, operation: Wordnik
  8. operation: Cambridge Advanced Learner's Dictionary
  9. operation: Wiktionary
  10. operation: Webster's New World College Dictionary, 4th Ed.
  11. operation: The Wordsmyth English Dictionary-Thesaurus
  12. operation: Infoplease Dictionary
  13. operation: Dictionary.com
  14. operation: Online Etymology Dictionary
  15. operation: Cambridge Essential American English Dictionary
  16. Operation (board game), Operation (game), Operation (mathematics), Operation (military), Operation, The Operation (TV film): Wikipedia, the Free Encyclopedia
  17. Operation: Online Plain Text English Dictionary
  18. operation: Webster's Revised Unabridged, 1913 Edition
  19. operation: Rhymezone
  20. Operation (f), operation: AllWords.com Multi-Lingual Dictionary
  21. operation: Webster's 1828 Dictionary
  22. operation: FreeDictionary.org
  23. operation: Mnemonic Dictionary
  24. operation: TheFreeDictionary.com
  25. 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 (8 matching dictionaries)
  1. operation: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Operation: MedTerms.com Medical Dictionary
  4. Operation: Merck Manuals
  5. online medical dictionary (No longer online)
  6. KidsHealth Glossary of Medical Words (No longer online)
  7. Operation (disambiguation), operation: Medical dictionary
  8. 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:  (uncountable) The method by which a device performs its function.
noun:  (uncountable) The method or practice by which actions are done.
noun:  (uncountable) The act or process of operating (verb): agency; the exertion of power, physical, mechanical, or moral.
noun:  (countable) A planned undertaking.
noun:  (countable) A business or organization.
noun:  (countable) (medicine) A surgical procedure.
noun:  (computing, logic, mathematics, countable) A procedure for generating a value from one or more other values (the operands).
noun:  (mathematics, more formally, countable) A function which maps zero or more (but typically two) operands to a single output value.
noun:  (military, countable) A military campaign (e.g. Operation Desert Storm).
noun:  (obsolete, countable) Effect produced; influence.

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