reflex ( reflexes plural )
1 n-count A reflex or a reflex action is something that you do automatically and without thinking, as a habit or as a reaction to something.
Walsh fumbled in his pocket, a reflex from his smoking days...
2 n-count A reflex or a reflex action is a normal, uncontrollable reaction of your body to something that you feel, see, or experience.
...tests for reflexes, like tapping the knee or the heel with a rubber hammer.
3 n-plural Your reflexes are your ability to react quickly with your body when something unexpected happens, for example when you are involved in sport or when you are driving a car.
It takes great skill, cool nerves and the reflexes of an athlete.
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"