Did you know?

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

appendix - 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 [countable]     appendix pronunciation in American English
Word Forms
pluralappendixes or appendices
  1. 1
    medical a small tube that is joined to your large intestine. It has no particular use and is removed in a medical operation if it becomes infected.
  2. 2
    a section giving extra details at the end of a book, part of a book, or document

    Technical specifications are included in the appendix to Chapter 9.


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