React

v. 1 (often foll. by to respond to a stimulus; change or behave differently due to some influence (re acted badly to the news). 2 (often foll. by against) respond with repulsion to; tent in a reverse or contrary direction. (foll. by with) (of a substance or particle be the cause of chemical activity ca interaction with another (nitrous oxich reacts with the metal). 4 (foll. by with cause (a substance) to react wits another.