Meaning of REACT in English

v. 25B6; verb

how he would react if she told him the truth? : BEHAVE, act, take it, conduct oneself; respond, reply, answer.

he reacted against the new regulations : REBEL AGAINST, oppose, rise up against.

Concise Oxford thesaurus English vocabulary.      Краткий оксфордский словарь английского языка тезаурус.