Did you know?

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

cleantech - 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.

noun [uncountable] cleantech pronunciation in British English /ˈkliːnˌtek/
  • Facebook
  • Twitter

or clean technology

  1. technology which provides benefits such as clean energy, and environmentally sustainable products and services
    Cleantech is on track to be the dominant force in venture capital investments over the next few years.
    1. a.
      [only before noun] using or based on cleantech
      This venture introduces UK cleantech companies to the lucrative Chinese market.


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