Usually means: Lacking reason, logic, or sense.
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We found 26 dictionaries that define the word irrationality:

General (21 matching dictionaries)
  1. irrationality: Merriam-Webster
  2. irrationality: Oxford Learner's Dictionaries
  3. irrationality: American Heritage Dictionary of the English Language
  4. irrationality: Collins English Dictionary
  5. irrationality: Vocabulary.com
  6. Irrationality, irrationality: Wordnik
  7. irrationality: Cambridge Advanced Learner's Dictionary
  8. irrationality: Wiktionary
  9. irrationality: Infoplease Dictionary
  10. Irrationality, irrationality: Dictionary.com
  11. Irrationality: Wikipedia, the Free Encyclopedia
  12. Irrationality: Online Plain Text English Dictionary
  13. irrationality: Webster's Revised Unabridged, 1913 Edition
  14. irrationality: Rhymezone
  15. Irrationality: AllWords.com Multi-Lingual Dictionary
  16. irrationality: Webster's 1828 Dictionary
  17. irrationality: FreeDictionary.org
  18. irrationality: Mnemonic Dictionary
  19. irrationality: TheFreeDictionary.com

Business (2 matching dictionaries)
  1. irrationality: Merriam-Webster Legal Dictionary
  2. irrationality: Legal dictionary

Computing (1 matching dictionary)
  1. irrationality: Encyclopedia

Medicine (2 matching dictionaries)
  1. irrationality: Merriam-Webster Medical Dictionary
  2. irrationality: Medical dictionary

(Note: See irrational as well.)

Definitions from Wiktionary (irrationality)

noun:  (uncountable) The quality or state of being irrational.
noun:  The state of being illogical or absurd.
noun:  (mathematics) The property of being an irrational number.
noun:  The state of being incapable of reason or abstract thought.
noun:  (countable) Something that is irrational; the result of an illogical or absurd thought or action.

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