react

Definitions

• (transitive) To act or perform a second time; to do over again; to reenact.
• (physics) To return an impulse or impression; to resist the action of another body by an opposite force
• (chemistry) To act upon each other; to exercise a reciprocal or a reverse effect, as two or more chemical agents; to act in opposition.
• (chemistry) To cause chemical agents to react; to cause one chemical agent to react with another.