Usually means: Not based on reason, logic.
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We found 35 dictionaries that define the word irrational:

General (25 matching dictionaries)
  1. irrational: Merriam-Webster.com
  2. irrational: Oxford Learner's Dictionaries
  3. irrational: American Heritage Dictionary of the English Language
  4. irrational: Collins English Dictionary
  5. irrational: Vocabulary.com
  6. Irrational, irrational: Wordnik
  7. irrational: Cambridge Advanced Learner's Dictionary
  8. irrational: Wiktionary
  9. irrational: Webster's New World College Dictionary, 4th Ed.
  10. irrational: The Wordsmyth English Dictionary-Thesaurus
  11. irrational: Infoplease Dictionary
  12. irrational: Dictionary.com
  13. irrational: Online Etymology Dictionary
  14. irrational: Cambridge Essential American English Dictionary
  15. Irrational: Wikipedia, the Free Encyclopedia
  16. Irrational: Online Plain Text English Dictionary
  17. irrational: Webster's Revised Unabridged, 1913 Edition
  18. irrational: Rhymezone
  19. irrational, irrational: AllWords.com Multi-Lingual Dictionary
  20. irrational: Webster's 1828 Dictionary
  21. irrational: Free Dictionary
  22. irrational: Mnemonic Dictionary
  23. irrational: Dictionary/thesaurus

Business (2 matching dictionaries)
  1. Glossary of Legal Terms (No longer online)
  2. irrational: Legal dictionary

Computing (1 matching dictionary)
  1. irrational: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. irrational: Medical dictionary

Religion (1 matching dictionary)
  1. Irivng Hexham's Concise Dictionary of Religion (No longer online)

Science (3 matching dictionaries)
  1. irrational: MATH SPOKEN HERE!
  2. irrational: PlanetMath Encyclopedia
  3. irrational, irrational: Prime

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

(Note: See irrationality as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Not rational; unfounded, nonsensical or wrong-headed.
adjective:  (mathematics, arithmetic, number theory, not comparable) Of a real number, that cannot be written as the ratio of two integers.
noun:  A real number that can not be expressed as the quotient of two integers, an irrational number.

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    chartreuse,     mauve,     puce,     fuchsia,     vermilion, more...



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