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1. (adj.) irrational
lacking the faculty of reason; deprived of reason.
2. irrational
lacking sound judgment or logic:
irrational arguments.
3. irrational
not controlled or governed by reason:
irrational behavior.
4. irrational
(of a number) not capable of being expressed exactly as a ratio of two integers.
5. irrational
(of a function) not capable of being expressed exactly as a ratio of two polynomials.
6. irrational
(of an equation) having an unknown under a radical sign or, alternately, with a fractional exponent.
7. irrational
of or pertaining to a syllable in Greek or Latin prosody whose quantity does not fit the meter.
Etymology: (1425–75; late ME < L)
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| Definition of 'irrational' |
Princeton's WordNet |
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1. (adj) irrational number, irrational
a real number that cannot be expressed as a rational number
2. (adj) irrational
not consistent with or using reason
"irrational fears"; "irrational animals"
3. (adj) irrational
real but not expressible as the quotient of two integers
"irrational numbers"
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| Definition of 'irrational' |
Webster Dictionary |
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1. (adj) irrational
not rational; void of reason or understanding; as, brutes are irrational animals
2. (adj) irrational
not according to reason; absurd; foolish
3. (adj) irrational
not capable of being exactly expressed by an integral number, or by a vulgar fraction; surd; -- said especially of roots. See Surd
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Definitions of irrational 
