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  1. Dictionary
    irrational
    /ɪˈraʃən(ə)l/

    adjective

    • 1. not logical or reasonable: "irrational feelings of hostility"
    • 2. (of a number, quantity, or expression) not expressible as a ratio of two integers, and having an infinite and non-recurring 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 or quantity; a surd.

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  2. dictionary.cambridge.org › dictionary › englishIRRATIONAL | English meaning - Cambridge Dictionary

    Irrational means not using reason or clear thinking, or not based on logic. Learn how to pronounce it and see examples and translations in different languages.

  3. www.merriam-webster.com › dictionary › irrationalIrrational Definition & Meaning - Merriam-Webster

    Jul 24, 2012 · Learn the meaning of irrational as an adjective and a noun, with synonyms, examples, and word history. Find out how irrational can describe a number, a being, a fear, or a decision.

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  5. www.dictionary.com › browse › irrationalIRRATIONAL Definition & Meaning | Dictionary.com

    Irrational definition: without the faculty of reason; deprived of reason.. See examples of IRRATIONAL used in a sentence.

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

    Usually you use irrational to describe ideas and thoughts that are not based on reason, although emotions and behavior can be irrational too if they don't seem reasonable. Do you jump onto a chair and scream when you see a mouse? If so, you have an irrational fear of mice, or musophobia.

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

    Learn the meaning of irrational as an adjective to describe illogical or unreasonable behaviour, feelings, or numbers. See synonyms, pronunciation, and usage examples from various sources.

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

    Irrational means not consistent with or using reason, or not expressible as a ratio of integers. Learn the synonyms, antonyms, and usage of irrational in mathematics, poetry, and psychology.

  9. www.oxfordlearnersdictionaries.com › english › irrationalirrational adjective - Definition, pictures, pronunciation and...

    Learn the meaning, pronunciation and usage of the adjective irrational, which means not based on clear logical thought. See synonyms, examples and word origin.