Definitions for: Irrational

[adj] not consistent with or using reason; "irrational fears"; "irrational animals"
[adj] (math) real but not expressible as the quotient of two integers; "irrational numbers"

Webster (1913) Definition: 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.

Synonyms: blind, incoherent, jaundiced, nonrational, reasonless, superstitious, unreasoning, yellow

Antonyms: rational, rational

See Also: illogical, unlogical, unreasonable

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