"irrational number." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/irrational-number>.
irrational number. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/irrational-number
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.