American English

Definition of reflex noun from the Oxford Advanced American Dictionary

 

reflex

 noun
noun
NAmE//ˈriflɛks//
 
 
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an action or a movement of your body that happens naturally in response to something and that you cannot control; something that you do without thinking The doctor tested her reflexes. to have quick/slow reflexes a reflex response/reaction Only the goalie's quick reflexes (= his ability to react quickly) stopped the ball from going in. Almost as a reflex action, I grab my pen as the phone rings.
See the Oxford Advanced Learner's Dictionary entry: reflex

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