Did you know?

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

reflex - 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]     reflex pronunciation in British English
Word Forms
Related words
  1. 1
    a movement that your muscles make without you thinking about it or being able to control it

    The blinking reflex can be set off by bright light.

    The doctor tested all his reflexes.

  2. 2
    a way of reacting to something that you do very quickly, without thinking about it

    Boxers need to have very quick reflexes.

    1. a.
      [only before noun] a reflex movement or action is one that you do very quickly, without thinking about it

      The goalkeeper made a couple of superb reflex saves.



to manipulate someone psychologically so that they begin to question their own perceptions and memories

BuzzWord Article

Open Dictionary

Dunning-Kruger effect

the phenomenon by which an incompetent person is too incompetent to understand his own incompetence

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