1560–70; < Late Latin ratiōnālitās reasonableness. See rational, -ity

antirationality, noun, adjective
nonrationality, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rationality (ˌræʃəˈnælɪtɪ)
n , pl -ties
1.  the state or quality of being rational or logical
2.  the possession or utilization of reason or logic
3.  a reasonable or logical opinion
4.  economics the assumption that an individual will compare all possible combinations of goods and their prices when making purchases

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