American Dictionary

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Definition reflex in American English

reflex noun

[countable] noun
/ˈriˌfleks/
1

a movement that your muscles make without you thinking about it or being able to control it

Example

The blinking reflex can be set off by bright light.

Example

The doctor tested all his reflexes.

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2

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

Example

Boxers need to have very quick reflexes.

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2.1

a reflex movement or action is one that you do very quickly, without thinking about it

Example

The goalkeeper made a couple of excellent reflex saves.

Synonyms and related words
Definition reflex in American English