rational Meaning in the Cambridge English Dictionary
Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

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.
More 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

More meanings of “rational”

Word of the Day

harvest

to pick and collect crops, or to collect plants, animals, or fish to eat

Word of the Day

In London but at the station: prepositions for talking about travel
In London but at the station: prepositions for talking about travel
by Liz Walter,
September 02, 2015
Several readers have asked for information on prepositions, so I will start with a blog post that looks at an area where they are really important: travel. The first thing to remember is that we use to (and not ‘in’) after the verb go: We are going to London. I went to

Read More 

parklet noun
parklet noun
August 31, 2015
a public outdoor space that may be associated with a local business but where anyone can sit Pop-up cafes in NY are what’s actually called parklets in many other places around the country.

Read More