REACT', verb transitive [re and act.] To act or perform a second time; as, to react a play. The same scenes were reacted at Rome. REACT', verb intransitive 1. To return an impulse or impression; to resist the action of another body by an opposite force. Every elastic body reacts on the body that impels it from its natural state. 2. To act in opposition; to resist any influence or power.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI