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English definition of “rational”

rational

adjective     /ˈræʃ.ən.əl/
C1 showing clear thought or reason : He was too upset to be rational. a rational course of action / argument / explanation Logic and reason rationality     /ˌræʃ.ənˈæl.ɪ.ti/ US  /-ə.t̬i/ noun [U] Mind and personalityScience of psychology and psychoanalysis
(Definition of rational adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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