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- Dictionaryirrational/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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The meaning of IRRATIONAL is not rational. How to use irrational in a sentence. not rational: such as; lacking usual or normal mental clarity or coherence; not endowed with reason or understanding…
IRRATIONAL definition: 1. not using reason or clear thinking: 2. not using reason or clear thinking: 3. not based on…. Learn more.
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.
If you describe someone's feelings and behaviour as irrational, you mean they are not based on logical reasons or clear thinking.
1. lacking the faculty of reason; deprived of reason. 2. lacking sound judgment or logic: irrational arguments. 3. not controlled or governed by reason: irrational behavior. 4. a. (of a number) not capable of being expressed exactly as a ratio of two integers. b. (of a function) not capable of being expressed exactly as a ratio of two polynomials.
Definition of irrational adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
Irrational behavior or decisions often stem from emotions, biases, or instinctual responses rather than objective reasoning. It disregards evidence, ignores facts, and may even defy common sense.
Designating a real number not expressible as an integer or as a quotient of two integers: √3 and pi are irrational numbers.
IRRATIONAL meaning: 1 : not rational: such as; 2 : not thinking clearly not able to use reason or good judgment
What does the word irrational mean? There are six meanings listed in OED's entry for the word irrational. See ‘Meaning & use’ for definitions, usage, and quotation evidence. irrational has developed meanings and uses in subjects including. OED is undergoing a continuous programme of revision to modernize and improve definitions.
