Definition of irrational number noun from the Oxford Advanced Learner's Dictionary

 

irrational number

 noun
noun
BrE
 
; NAmE
 
(also surd)(mathematics) Mathematical terminology
 
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a number, for example π or the square root of 2, that cannot be expressed as the ratio of two whole numbers See related entries: Mathematical terminology
See the Oxford Advanced American Dictionary entry: irrational number