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IRRATIONAL - Definiția din dicționar

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ir*ra"tion*al (ĭr*răsh"ŭn*&aitalic_;l), 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.

Syn. -- Absurd; foolish; preposterous; unreasonable; senseless. See Absurd.
[1913 Webster]