Irrational is defined as lacking reason or understanding.adjective
An example of irrational is a fear of a certain color.
The definition of an irrational is a number that cannot be expressed as a fraction.noun
An example of irrational is pi.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
- lacking the power to reason
- contrary to reason; senseless; unreasonable; absurd
- Math. designating a real number not expressible as an integer or as a quotient of two integers: √ and pi are irrational numbers
Origin: ME < L irrationalis: see in- & rational
Used by arrangement with John Wiley & Sons, Inc.
- a. Not endowed with reason.b. Affected by loss of usual or normal mental clarity; incoherent, as from shock.c. Marked by a lack of accord with reason or sound judgment: an irrational dislike.
- a. Being a syllable in Greek and Latin prosody whose length does not fit the metric pattern.b. Being a metric foot containing such a syllable.
- Mathematics Of or relating to an irrational number.
- ir·raˈtion·al·ly adverb
- ir·raˈtion·al·ness noun
irrational - Medical Definition