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Irra"tional (), a.[L. irrationalis: cf. F. irrationnel. See In- not, and Rational.] 1. Not rational; void of reason or understanding; as, brutes are irrational animals. 2. Not according to reason; absurd; foolish. It seemed utterly irrational any longer to maintain it. I. Taylor. 3. (Math.) Not capable of being exactly expressed by an integral number, or by a vulgar fraction; surd; -- said especially of roots. See Surd. Syn. -- Absurd; foolish; preposterous; unreasonable; senseless. See Absurd.
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