Did you know?

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

their - definition and synonyms


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.

determiner their pronunciation in British English /ðeə(r)/
  • Facebook
  • Twitter
Their is used as a possessive determiner (followed by a noun), being a possessive form of they.
  1. 1
    belonging to or relating to a particular group of people or things that have already been mentioned or when it is obvious which ones you are referring to
    Workers are afraid that they will lose their jobs.
    She has made a study of chemical fertilizers and their effect on the environment.
    of their own: They have children of their own.
    Synonyms and related words
  2. 2
    mainly spoken used instead ofhis or her’, especially when you are referring back to a word such aseveryone’, ‘someone’, oranyone. Many people consider this use incorrect
    Everyone has their own way of doing things.
    Synonyms and related words
    See also they


a course of study which is much shorter than a university course and focuses on the skills you need for a job, especially computer-related skills

BuzzWord Article

Open Dictionary


an ancient Roman system of underfloor heating, used to heat houses with hot air; from the Latin 'hypocaustum'

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