Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “brain”

brain

noun
 
 
/breɪn/
ORGAN [C] A2 the organ inside your head that controls your thoughts, feelings, and movements: brain damage The brain and nervous system
PERSON [C] informal an extremely intelligent person: [usually plural] This university attracts some of the best brains in the country.IntelligencePerceptive
brains intelligence: He has brains and good looks.IntelligencePerceptive
have sth on the brain informal to think or talk about something all the time: You have football on the brain!Continually thinking about
the brains behind sth informal the person who has planned and organized something successful: Anthony is the brains behind the project.IntelligencePerceptive
(Definition of brain from the Cambridge Learners Dictionary © Cambridge University Press)
Add Cambridge dictionaries to your browser to your website

More Learner's Dictionary definitions for “brain”

Definitions of “brain” in other dictionaries

Word of the Day

hoppy

like hops (= dried fruit used to make beer)

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More