Usually means: Irrational fear of perceived threats.
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We found 37 dictionaries that define the word paranoia:

General (25 matching dictionaries)
  1. paranoia: Longman Dictionary of Contemporary English
  2. paranoia: Merriam-Webster
  3. paranoia: Oxford Learner's Dictionaries
  4. paranoia: American Heritage Dictionary of the English Language
  5. paranoia: Collins English Dictionary
  6. paranoia: Vocabulary.com
  7. Paranoia, paranoia: Wordnik
  8. paranoia: Wiktionary
  9. paranoia: Webster's New World College Dictionary, 4th Ed.
  10. paranoia: The Wordsmyth English Dictionary-Thesaurus
  11. paranoia: Infoplease Dictionary
  12. paranoia: Dictionary.com
  13. paranoia: Online Etymology Dictionary
  14. paranoia: Cambridge Essential American English Dictionary
  15. Paranoia (A Day to Remember song), Paranoia (Brooklyn Nine-Nine), Paranoia (disambiguation), Paranoia (film), Paranoia (game show), Paranoia (novel), Paranoia (role-playing game), Paranoia (video game), Paranoia: Wikipedia, the Free Encyclopedia
  16. Paranoia: Online Plain Text English Dictionary
  17. paranoia: Webster's Revised Unabridged, 1913 Edition
  18. paranoia: Rhymezone
  19. Paranoia (f), paranoia, paranoia, paranoia, paranoia (de): AllWords.com Multi-Lingual Dictionary
  20. paranoia: FreeDictionary.org
  21. paranoia: Mnemonic Dictionary
  22. paranoia: TheFreeDictionary.com
  23. paranoia: Cambridge Advanced Learner's Dictionary

Business (1 matching dictionary)
  1. paranoia: Legal dictionary

Computing (1 matching dictionary)
  1. paranoia: Encyclopedia

Medicine (8 matching dictionaries)
  1. paranoia: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Paranoia: Merck Manuals
  4. online medical dictionary (No longer online)
  5. paranoia: Dictionary of Cancer Terms
  6. paranoia: Medical dictionary
  7. WeMove Glossary of Terms (No longer online)
  8. Hyperdictionary (No longer online)

Miscellaneous (2 matching dictionaries)
  1. Brilliant Dream Dictionary (No longer online)
  2. paranoia: Wordcraft Dictionary

(Note: See paranoiac as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  The obsolete name for a psychotic disorder, now called delusional disorder, often (in one of 6 subtypes) characterized by delusions of persecution and perceived threat against the individual affected with the disorder, and often associated with false accusations and general mistrust of others
noun:  Extreme, irrational distrust of others.

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