Did you know?

Click any word in a definition or example to find the entry for that word

brain - definition and synonyms

 
 
 
Close

What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.

Close

Thesaurus

The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

more
noun brain pronunciation in American English /breɪn/
Word Forms
Close
singularbrain
pluralbrains
  • Facebook
  • Twitter
  1. 1
    [countable] the organ inside your head that allows you to think and feel, and controls your body
    The human brain is divided into two halves.
    1. a.
      [only before noun] belonging to or connected with the brain
      a brain tumor/scan/operation
      brain activity/function
    2. b.

      brains

      [plural] the brain of an animal cooked and eaten as food
      Synonyms and related words
  2. 2
    [countable] [often plural] mental ability or intelligence
    You have to use your brains in this job.
    have brains/a brain (=be intelligent): He’s good-looking, and he has brains.
    1. a.
      [countable] an intelligent person
      The best brains in the country have failed to solve this problem.

ruburb

an area in the countryside where there are both housing developments and farms, and many people travel to work in nearby cities

BuzzWord Article

Open Dictionary

troll factory

a company that pays its employees to write online comments in favour or against somebody or something posing as ordinary Internet users

add a word

Blog

A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog