rational Meaning in the Cambridge English Dictionary Cambridge dictionaries logo

Meaning of “rational” in the English Dictionary

"rational" in British English

See all translations

rationaladjective

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.

expend iconexpend iconMore examples

rationality
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

See all translations

rationaladjective

 us   /ˈræʃ·ə·nəl/
showingclearthought or ​reason: a rational ​decision Obviously, he wasn’t rational.
rationally
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)
What is the pronunciation of rational?
Add Cambridge dictionaries to your browser to your website

“rational” in British English

“rational” in American English

More meanings of “rational”

Word of the Day

float

a large vehicle with a flat surface that is decorated and used in festivals

Word of the Day

Chest pains and palpitations: talking about illness (2)
Chest pains and palpitations: talking about illness (2)
by Liz Walter,
February 03, 2016
My previous post (My leg hurts: Talking about illness (1)) presented some general vocabulary to use at the doctor’s. This one looks at some more specific areas of illness and explains some useful words and phrases that you may need to use or understand on a visit to the doctor’s. There are several

Read More 

farecasting noun
farecasting noun
February 08, 2016
predicting the optimum date to buy a plane ticket, especially on a website or using an app A handful of new and updated websites and apps are trying to perfect the art of what’s known as farecasting – predicting the best date to buy a ticket.

Read More