Usually means: Protection against unauthorized access, harm.
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We found 72 dictionaries that define the word security:

General (26 matching dictionaries)
  1. security: Longman Dictionary of Contemporary English
  2. security: Merriam-Webster
  3. security: Oxford Learner's Dictionaries
  4. security: American Heritage Dictionary of the English Language
  5. security: Collins English Dictionary
  6. security: Vocabulary.com
  7. Security, security: Wordnik
  8. security: Cambridge Advanced Learner's Dictionary
  9. security: Wiktionary
  10. security: Webster's New World College Dictionary, 4th Ed.
  11. security: The Wordsmyth English Dictionary-Thesaurus
  12. security: Infoplease Dictionary
  13. security: Dictionary.com
  14. security: Cambridge Essential American English Dictionary
  15. Security (album), Security (computers), Security (computing), Security (disambiguation), Security (film), Security (finance), Security: Wikipedia, the Free Encyclopedia
  16. Security: Online Plain Text English Dictionary
  17. security: Webster's Revised Unabridged, 1913 Edition
  18. security: Rhymezone
  19. security: AllWords.com Multi-Lingual Dictionary
  20. security: Webster's 1828 Dictionary
  21. security: FreeDictionary.org
  22. security: Mnemonic Dictionary
  23. security: TheFreeDictionary.com
  24. security: Wikimedia Commons US English Pronunciations

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

Business (29 matching dictionaries)
  1. security: Merriam-Webster Legal Dictionary
  2. MoneyGlossary.com (No longer online)
  3. security: Webster's New World Finance & Investment Dictionary
  4. security: Webster's New World Law Dictionary
  5. Duhaime's Canadian law dictionary (No longer online)
  6. Travel Industry Dictionary (No longer online)
  7. INVESTORWORDS (No longer online)
  8. THE 'LECTRIC LAW LIBRARY'S REFERENCE ROOM (No longer online)
  9. SECURITY: Accounting Glossary
  10. Glossary of Legal Terms (No longer online)
  11. Security: bizterms.net
  12. Security: Harvey Financial
  13. Security: Moneyterms
  14. security: Finance-Glossary.com
  15. MonsterMoving Mortgage Glossary (No longer online)
  16. Real Estate and Mortgage Glossary (No longer online)
  17. Bouvier's Law Dictionary 1856 Edition (No longer online)
  18. Security: Investopedia
  19. Broadcast Media Terms (No longer online)
  20. Security: INSOLVENCY
  21. Security: Securities Terminology
  22. Security (finance), The security, security: Legal dictionary
  23. Security (finance), The security, security: Financial dictionary
  24. Accounting, Business Studies and Economics Dictionary (No longer online)
  25. BusinessDictionary.com (No longer online)
  26. Security: WashingtonPost.com: Business
  27. Yahoo Tax Center Glossary (No longer online)
  28. security: Bloomberg Financial Glossary
  29. Security: Bloomberg Financial Glossary

Computing (8 matching dictionaries)
  1. security: Webster's New World Hacker Dictionary
  2. security: Free On-line Dictionary of Computing
  3. security: Netlingo
  4. security: Computer Telephony & Electronics Dictionary and Glossary
  5. Security: Linktionary Networking Glossary
  6. Webopedia (No longer online)
  7. I T Glossary (No longer online)
  8. Security (computers), Security (finance), The security, security: Encyclopedia

Medicine (1 matching dictionary)
  1. security: Merriam-Webster Medical Dictionary

Miscellaneous (4 matching dictionaries)
  1. Political (No longer online)
  2. Brilliant Dream Dictionary (No longer online)
  3. Glossary of Ethical Terms (No longer online)
  4. security: Idioms

Slang (1 matching dictionary)
  1. Security[piss], The Security, security: Urban Dictionary

Tech (2 matching dictionaries)
  1. security: Webster's New World Telecom Dictionary
  2. DOD Dictionary of Military Terms (No longer online)

(Note: See securities as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (uncountable) The condition of not being threatened, especially physically, psychologically, emotionally, or financially.
noun:  (countable) Something that secures.
noun:  An organization or department responsible for providing security by enforcing laws, rules, and regulations as well as maintaining order.
noun:  (law) Something that secures the fulfillment of an obligation or law.
noun:  (law) Freedom from apprehension.
noun:  (finance, often in the plural) A tradeable financial asset, such as a share of stock.ᵂ
noun:  (finance) Proof of ownership of stocks, bonds or other investment instruments.
noun:  (finance) Property etc. temporarily relinquished to guarantee repayment of a loan.
noun:  A guarantee.
noun:  (obsolete) Carelessness; negligence.

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