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   irrational

   /ɪˈraʃən(ə)l/

   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 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.

   Word Origin late Middle English: from Latin irrationalis, from in- ‘not’ + rationalis (see rational).

   Scrabble Points: 10

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