IRRATIONAL NUMBER
\ɪɹˈaʃənə͡l nˈʌmbə], \ɪɹˈaʃənəl nˈʌmbə], \ɪ_ɹ_ˈa_ʃ_ə_n_əl n_ˈʌ_m_b_ə]\
Definitions of IRRATIONAL NUMBER
 2006  WordNet 3.0
 2011  English Dictionary Database
 1985  The Free Online Dictionary of Computing
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By Princeton University
By DataStellar Co., Ltd

A real number which is not a rationalnumber, i.e. it is not the ratio of two integers.The decimal expansion of an irrational is infinite but doesnot end in an infinite repeating sequence of digits.Examples of irrational numbers are pi, e and the squareroot of two.
By Denis Howe