1. respond or behave in a particular way in response to something: "he reacted angrily to the news of his dismissal"Similarbehaveacttake itconduct oneselfproceedrespondreplyanswerretaliaterare:comport oneselfrebel againstopposerevolt againstrise up against
▪ respond with hostility, opposition, or a contrary course of action to: "they reacted against the elite art music of their time"
▪ (of a person) suffer from adverse physiological effects after ingesting, breathing, or touching a substance: "many babies react to soy-based formulas"
▪ interact and undergo a chemical or physical change: "the sulfur in the coal reacts with the limestone during combustion"
▪ cause (a substance) to undergo a change by interacting with another substance.
▪ (of stock prices) fall or rise in reaction to events, developments, etc.
Word Originlate 16th century: from re- (expressing intensive force or reversal) + act, originally suggested by late Latin react- ‘done again’, from the verb reagere.
