2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irrational \Ir*ra"tion*al\, 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}.
From WordNet r 1.6 [wn]:
irrational
adj 1: not consistent with or using reason; "irrational fears";
"irrational animals" [ant: {rational}]
2: (math) real but not expressible as the quotient of two
integers; "irrational numbers" [ant: {rational}]
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