Did you know?

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


 - definitions and thesaurus

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.



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.

adjective mental pronunciation in American English /ˈment(ə)l/
  1. 1
    [only before noun] existing in the mind

    It is clear that mental activity does not stop when we're asleep.

    mental picture/image:

    I had a complete mental picture of the building I wanted to create.

    1. a.
      relating to the mind

      mental agility/development

    2. b.
      relating to the health of the mind, or illnesses of the mind

      mental health problems

      He suffered a complete mental collapse.

  2. 2
    informal old-fashioned mentally ill

derived word


 mental pronunciation in American English  adverb

He was in good health both physically and mentally.

mentally ill


web content which is specifically intended to make Facebook users click the 'Like' button associated with it

BuzzWord Article

Open Dictionary


the possibility of Greece leaving the Eurozone …

add a word


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