1. [ verb ] show a response or a reaction to something
Synonyms: respond
Related terms: act refuse accept accept answer wonder explode greet notice respond stool answer treat overreact accept refuse reaction respondent
2. [ verb ] act against or in opposition to
Synonyms: oppose

"She reacts negatively to everything I say"

Related terms: act pursue buck backfire adversary
3. [ verb ] (chemistry) undergo a chemical reaction; react with another substance under certain conditions

"The hydrogen and the oxygen react"

Related terms: change_state bromate chemistry
Similar spelling:   recto