a. [ L. irrationalis: cf. F. irrationnel. See In- not, and Rational. ] [ 1913 Webster ]
1. Not rational; void of reason or understanding; as, brutes are irrational animals. [ 1913 Webster ]
2. Not according to reason; having no rational basis; clearly contrary to reason; easily disproved by reasoning; absurd; -- of assertions and beliefs. Hence, of actions: foolish; unreasonable. [ 1913 Webster +PJC ]
It seemed utterly irrational any longer to maintain it. I. Taylor. [ 1913 Webster ]
3. (Math.) Not capable of being exactly expressed by an integral number, nor by a ratio of integral numbers; surd; -- said especially of roots. See Surd.
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