Definition of “reflex” - English Dictionary

“reflex” in American English

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reflexnoun [ C usually pl ]

us /ˈriˌfleks/

a sudden, automatic reaction to something:

He’s strong, always has good positioning, and his reflexes are fantastic.

biology A reflex is also an automatic reaction involving nerve cells that is not controlled by the brain, and, therefore, does not involve choice, for example, sneezing or vomiting

(Definition of “reflex” from the Cambridge Academic Content Dictionary © Cambridge University Press)