Definition of reflex noun from the Oxford Advanced Learner's Dictionary

 

reflex

 noun
noun
BrE BrE//ˈriːfleks//
 
; NAmE NAmE//ˈriːfleks//
 
 
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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 goalkeeper's 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. Word Origin early 16th cent. (as a noun denoting reflection): from Latin reflexus ‘a bending back’, from reflectere ‘bend back’, from re- ‘back’ + flectere ‘to bend’.Extra examples Almost as a reflex action, I grab my pen as the phone rings. Almost by reflex, he helped himself to a drink. He reacts with lightning fast reflexes. The rapid movement of an object close to the eye triggers an automatic reflex. The training is designed to sharpen the fighter’s reflexes.
See the Oxford Advanced American Dictionary entry: reflex

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