react

1. (intransitive) To act in response.Examples: "How did she react to the news?"Synonyms: takeintransitive

2. (transitive, now rare) To act or perform a second time; to do over again; to reenact.Examples: "It is somewhat extraordinary, that the offence for which James II, was expelled, that of setting up power by assumption, should be re-acted, under another shape and form, by the parliament that expelled him."archaictransitive

3. (physics, intransitive) To return an impulse or impression; to resist the action of another body by an opposite forceExamples: "Every body reacts on the body that impels it from its natural state."intransitive

4. (chemistry, intransitive) To act upon each other; to exercise a reciprocal or a reverse effect, as two or more chemical agents; to act in opposition.intransitive

5. (chemistry, transitive) To cause chemical agents to react; to cause one chemical agent to react with another.transitive

6. (Internet, intransitive) To post a reaction (icon or emoji indicating how one feels about a posted message).Internetintransitive