Usually means: Perception not aligned with reality.
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We found 42 dictionaries that define the word illusion:

General (25 matching dictionaries)
  1. illusion: Merriam-Webster.com
  2. illusion: Oxford Learner's Dictionaries
  3. illusion: American Heritage Dictionary of the English Language
  4. illusion: Collins English Dictionary
  5. illusion: Vocabulary.com
  6. Illusion, illusion: Wordnik
  7. illusion: Cambridge Advanced Learner's Dictionary
  8. illusion: Wiktionary
  9. illusion: Webster's New World College Dictionary, 4th Ed.
  10. illusion: The Wordsmyth English Dictionary-Thesaurus
  11. illusion: Infoplease Dictionary
  12. illusion: Dictionary.com
  13. illusion: Online Etymology Dictionary
  14. illusion: Cambridge Essential American English Dictionary
  15. Illusion (Krassimir Avramov song), Illusion (Poor Moon EP), Illusion (Renaissance album), Illusion (Shahin Najafi album), Illusion (UK band), Illusion (band), Illusion (company), Illusion (disambiguation), Illusion (keelboat), Illusion (musical), Illusion (series), Illusion (video game series), Illusion, The Illusion (Animorphs), The Illusion (album), The Illusion (band), The Illusion (novel), The Illusion (play): Wikipedia, the Free Encyclopedia
  16. Illusion: Online Plain Text English Dictionary
  17. illusion: Webster's Revised Unabridged, 1913 Edition
  18. illusion: Rhymezone
  19. Illusion (f), illusion, illusion (f): AllWords.com Multi-Lingual Dictionary
  20. illusion: Webster's 1828 Dictionary
  21. illusion: Free Dictionary
  22. illusion: Mnemonic Dictionary
  23. illusion: Dictionary/thesaurus

Art (1 matching dictionary)
  1. illusion: ArtLex Lexicon of Visual Art Terminology

Business (2 matching dictionaries)
  1. Bouvier's Law Dictionary 1856 Edition (No longer online)
  2. illusion: Legal dictionary

Computing (1 matching dictionary)
  1. illusion: Encyclopedia

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

Miscellaneous (2 matching dictionaries)
  1. Sound-Alike Words (No longer online)
  2. Illusion: Glossary of Terms in Parapsychology

Science (1 matching dictionary)
  1. Illusion: Eric Weisstein's World of Mathematics

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

Tech (1 matching dictionary)
  1. Textile (No longer online)

(Note: See illusional as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (countable) Anything that seems to be something that it is not.
noun:  (countable) A misapprehension; a belief in something that is in fact not true.
noun:  (countable) A magician’s trick.
noun:  (uncountable) The state of being deceived or misled.

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Types:

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Colors:
    opal,     lavender,     phantom black,     ethereal white,     smoky quartz, more...



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