rational Meaning in the Cambridge English Dictionary
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Meaning of “rational” in the English Dictionary

"rational" in British English

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uk   us   /ˈræʃ.ən.əl/
C1 based on ​clearthought and ​reason: There must be some rational explanation for what ​happened. a rational act/​course of ​action a rational argument/​decision He was too ​upset to be rational.
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noun [U] uk   /ˌræʃ.ənˈæl.ɪ.ti/  us   /-ə.t̬i/
Science ​rests on the ​ideals of ​objectivity and rationality.
(Definition of rational from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"rational" in American English

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 us   /ˈræʃ·ə·nəl/
showingclearthought or ​reason: a rational ​decision Obviously, he wasn’t rational.
adverb [not gradable]  us   /ˈræʃ·ə·nəl·i/
It’s hard to ​behave rationally at such ​times.
(Definition of rational from the Cambridge Academic Content Dictionary © Cambridge University Press)
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