1 [C] (also reflex action) a sudden movement or action that you make without thinking 反射作用；本能反应: She put her hands out as a reflex to stop her fall. 她凭本能反应伸出双手，以防跌倒。

2 reflexes [pl] the ability to act quickly when necessary 反应能力: A good tennis player needs to have excellent reflexes. 出色的网球员需要有极佳的反应能力。