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1. Dictionary

   Ir·ra·tion·al

   /i(r)ˈraSH(ə)nəl/

   

   adjective

   • 1. not logical or reasonable: "irrational feelings of hostility"
   • ▪ not endowed with the power of reason.
   • 2. (of a number, quantity, or expression) not expressible as a ratio of two integers, and having an infinite and nonrecurring expansion when expressed as a decimal. Examples of irrational numbers are the number π and the square root of 2.

   noun

   • 1. an irrational number.

   Word Origin late Middle English: from Latin irrationalis, from in- ‘not’ + rationalis (see rational).

   Scrabble Points: 10

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2. www.vocabulary.com › dictionary › irrationalIrrational - Definition, Meaning & Synonyms | Vocabulary.com

   www.vocabulary.com › dictionary › irrational

   Definitions of irrational. adjective. not consistent with or using reason. “ irrational fears” “ irrational animals” synonyms: incoherent. without logical or meaningful connection. illogical, unlogical. lacking in correct logical relation. blind, unreasoning. not based on reason or evidence. reasonless. not endowed with the capacity to reason.

3. www.collinsdictionary.com › dictionary › englishIRRATIONAL definition and meaning | Collins English Dictionary

   www.collinsdictionary.com › dictionary › english

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   5 days ago · 4 meanings: 1. inconsistent with reason or logic; illogical; absurd 2. incapable of reasoning 3. mathematics a. not rational b..... Click for more definitions.

4. dictionary.cambridge.org › us › dictionaryIRRATIONAL | definition in the Cambridge English Dictionary

   dictionary.cambridge.org › us › dictionary

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   irrational. adjective. us / ɪˈræʃ. ə n. ə l / uk / ɪˈræʃ. ə n. ə l /. Add to word list. Add to word list. C2. not using reason or clear thinking: It's totally irrational, but I'm frightened of mice. His parents were worried by his increasingly irrational behavior.

5. www.thefreedictionary.com › irrationalIrrational - definition of irrational by The Free Dictionary

   www.thefreedictionary.com › irrational

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   1. inconsistent with reason or logic; illogical; absurd. 2. incapable of reasoning. 3. (Mathematics) maths. a. not rational. b. ( as noun ): an irrational. 4. (Poetry) prosody (in Greek or Latin verse) a. of or relating to a metrical irregularity, usually the occurrence of a long syllable instead of a short one.

6. dictionary.cambridge.org › dictionary › learner-englishIRRATIONAL | meaning - Cambridge Learner's Dictionary

   dictionary.cambridge.org › dictionary › learner-english

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   uk / ɪˈræʃ ə n ə l / us. Add to word list. Irrational feelings and actions are based on your emotions and not on good reasons: irrational behaviour. an irrational fear of flying. irrationality. noun [ U ] uk / ɪˌræʃ ə nˈæləti / us. irrationally. adverb. (Definition of irrational from the Cambridge Learner's Dictionary © Cambridge University Press)

7. www.oxfordlearnersdictionaries.com › definition › englishirrational adjective - Definition, pictures, pronunciation and...

   www.oxfordlearnersdictionaries.com › definition › english

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   Definition of irrational adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

8. www.dictionary.com › browse › irrationalIRRATIONAL Definition & Usage Examples | Dictionary.com

   www.dictionary.com › browse › irrational

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   Irrational definition: . See examples of IRRATIONAL used in a sentence.