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irrational number
noun
, Mathematics.
- a number that cannot be exactly expressed as a ratio of two integers.
irrational number
noun
- any real number that cannot be expressed as the ratio of two integers, such as π
irrational number
/ ĭ-răsh′ə-nəl /
- A number that cannot be expressed as a ratio between two integers and is not an imaginary number. If written in decimal notation, an irrational number would have an infinite number of digits to the right of the decimal point, without repetition. Pi and the square root of 2 (√2) are irrational numbers.
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Notes
The square roots of most whole numbers are irrational numbers.
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Word History and Origins
Origin of irrational number1
First recorded in 1545–55
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Example Sentences
In that theory an irrational number was the ratio of two incommensurable geometric magnitudes.
From Project Gutenberg
The widened idea is that even when a or x is an irrational number we may speak of a or x unit lengths by measure.
From Project Gutenberg
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