1. Adjective
Not rational; void of reason or understanding; as, brutes are irrational animals.
2. Adjective
Not according to reason; absurd; foolish.
3. Adjective
Not capable of being exactly expressed by an integral number, or by a vulgar fraction; surd; -- said especially of roots. See Surd.
4. Noun
a real number that cannot be expressed as a rational number
Vocabulary classified under Mathematics
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