Did you know?

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

glass - 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.

Thesaurus diagram

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     glass pronunciation in British English
Word Forms
  1. 1
    [uncountable] a hard clear substance used for making objects such as windows or bottles

    car windows made of bulletproof glass

    the sound of breaking glass

    slivers/shards of glass (=small broken pieces):

    She had six slivers of glass removed from her cheek.

    pane/sheet of glass:

    Each pane of glass costs several hundred pounds.

    1. a.
  2. 2
    [countable] a small container made of glass used for a drink

    a wine/brandy/beer glass

    He raised the glass to his lips and drained it at one gulp.

    1. a.
      the liquid in a glass, or the amount of liquid that a glass contains
      glass of:

      She drank three glasses of milk.

      Ramon poured himself a tall glass of gin and tonic.

  3. 3
    [uncountable] attractive objects made out of glass

    a beautiful collection of Italian glass

  4. 4
    [countable] old-fashioned a mirror
  5. 5

    the glass

    [countable] British old-fashioned a barometer
  • Facebook
  • Twitter

deep learning

a form of machine learning which incorporates the use of neural networks

BuzzWord Article

Open Dictionary

snap election

a general election … that is called earlier than expected

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
Macmillan learn live love play