| 单词 | reaction |
| 释义 | reaction n. 1. the act or an instance of reacting; a responsive or reciprocal action. 2. a a responsive feeling (what was your reaction to the news?). b an immediate or first impression. 3. the occurrence of a (physical or emotional) condition after a period of its opposite. 4. a bodily response to an external stimulus, e.g. a drug. 5. a tendency to oppose change or to advocate return to a former system, esp. in politics. 6. the interaction of substances undergoing chemical change. 7. propulsion by emitting a jet of particles etc. in the direction opposite to that of the intended motion. Derivatives reactionist n. & adj. Etymology: REACT + -ION or med.L reactio (as RE-, ACTION) |
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