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English definition of “reflex”

reflex

noun     /ˈriː.fleks/
[C] a physical reaction to something that you cannot control: I'm sorry I punched him, it was a reflex action/response.Reacting and responding reflexes [plural] the ability to react quickly: Fighter pilots need good/fast reflexes.Reacting and respondingResponding to an attack
(Definition of reflex noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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