Definition of rational adjective from the Oxford Advanced Learner's Dictionary

      

    rational

     adjective
    adjective
    BrE BrE//ˈræʃnəl//
     
    ; NAmE NAmE//ˈræʃnəl//
     
     
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  1. 1(of behaviour, 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.
  3. opposite irrational
    Word Origin late Middle English (in the sense ‘having the ability to reason’): from Latin rationalis, from ratio(n-) ‘reckoning, reason’, from rat- ‘reckoned’, from the verb reri.Extra examples Humans are essentially rational beings. It all seemed quite rational to me. Try to be rational about it. With children working from the age of ten, large families were economically rational. In some ways their behaviour is perfectly rational. She said that she had not been fully rational when she signed the form. She seems incapable of making a rational decision. There’s no rational explanation for his actions. We need to present them with a rational argument.
See the Oxford Advanced American Dictionary entry: rational

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