| irrational | 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. <mathematics> Not capable of being exactly expressed by an integral number, or by a vulgar fraction; surd; said especially of roots. See Surd. Synonym: Absurd, foolish, preposterous, unreasonable, senseless. See Absurd. Origin: L. Irrationalis: cf. F. Irrationnel. See In- not, and Rational. Source: Websters Dictionary (01 Mar 1998) |
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