- 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(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 rational in the Oxford Advanced Learner's DictionaryCheck pronunciation: rational