Usually means: Mistaken belief despite contrary evidence.
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We found 45 dictionaries that define the word delusion:

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

Business (3 matching dictionaries)
  1. Duhaime's Canadian law dictionary (No longer online)
  2. Bouvier's Law Dictionary 1856 Edition (No longer online)
  3. delusion: Legal dictionary

Computing (1 matching dictionary)
  1. delusion: Encyclopedia

Medicine (8 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Delusion: MedTerms.com Medical Dictionary
  3. Delusion: MedFriendly Glossary
  4. online medical dictionary (No longer online)
  5. Terms in the field of Psychiatry and Neurology (No longer online)
  6. delusion: Medical dictionary
  7. WeMove Glossary of Terms (No longer online)
  8. Delusion: Drug Medical Dictionary

Miscellaneous (4 matching dictionaries)
  1. Sound-Alike Words (No longer online)
  2. delusion: The Skeptic's Dictionary
  3. delusion: Idioms
  4. delusion: Stanford Encyclopedia of Philosophy

Religion (2 matching dictionaries)
  1. Buddhism Glossary (No longer online)
  2. Scientology® and Dianetics® (No longer online)

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

(Note: See delusional as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A false belief that is resistant to confrontation with actual facts.
noun:  The state of being deluded or misled, or process of deluding somebody.
noun:  That which is falsely or delusively believed or propagated; false belief; error in belief.
noun:  A fixed, false belief, that will not change, despite evidence to the contrary.

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