rational Definition in the Cambridge English Dictionary Cambridge dictionaries logo
Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

Definition of “rational” - English Dictionary

"rational" in American English

See all translations

rationaladjective

 us   /ˈræʃ·ə·nəl/
showing clear thought 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)







"rational" in British English

See all translations

rationaladjective

uk   /ˈræʃ.ən.əl/  us   /ˈræʃ.ən.əl/
C1 based on clear thought 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.ə.ti/  us   /ˌræʃ.ənˈæl.ə.t̬i/
Science rests on the ideals of objectivity and rationality.
(Definition of rational from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of rational?
Add Cambridge dictionaries to your browser to your website

More meanings of “rational”

A blazing row: words and phrases for arguing and arguments
A blazing row: words and phrases for arguing and arguments
by ,
May 04, 2016
by Kate Woodford We can’t always focus on the positive! This week, we’re looking at the language that is used to refer to arguing and arguments, and the differences in meaning between the various words and phrases. There are several words that suggest that people are arguing about something that is not important. (As you might

Read More 

Word of the Day

droid

a robot (= a machine controlled by computer) that is made to look like a human

Word of the Day

trigger warning noun
trigger warning noun
May 02, 2016
a warning that a subject may trigger unpleasant emotions or memories This is not, I should stress, an argument that trigger warnings should become commonplace on campus.

Read More