Definition of rational adjective from the Oxford Advanced American Dictionary

      

    rational

     adjective
    adjective
    NAmE//ˈræʃənl//
     
     
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  1. 1(of behavior, ideas, etc.) based on reason rather than emotions a rational argument/choice/decision rational analysis/thought There is no rational explanation for his actions.
  2. 2(of a person) able to think clearly and make decisions based on reason rather than emotions synonym reasonable No rational person would ever behave like that. opposite irrational
NAmE//ˌræʃəˈnælət̮i//
 
noun [uncountable] the rationality of his argument
NAmE//ˈræʃənəli//
 
adverb to act/behave/think rationally She argued her case calmly and rationally.
See the Oxford Advanced Learner's Dictionary entry: rational

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