Did you know?

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

sub- - 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.

prefix sub- pronunciation in American English /sʌb/
  1. 1
    below or under something: used with some nouns and adjectives
    subaqua diving (=diving under water)
    substandard (=below average)
    Synonyms and related words
    1. a.
      farther south: used with some nouns and adjectives
      sub-Saharan Africa
      the subarctic region
      Synonyms and related words
  2. 2
    smaller or less important than someone or something: used with some nouns
    a power substation
    Synonyms and related words
  3. 3
    one small part of a larger thing: used with some nouns
    a subset
    Synonyms and related words


… a feeling of pleasure you get from spending time doing what you want and not worrying about what other people are doing or saying

BuzzWord Article

Word of the Day

Mardi Gras

shrove tuesday

Open Dictionary

brain fade

a temporary inability to think clearly or remember information

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