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   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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