react Meaning, Definition & Usage

  1. verb show a response or a reaction to something
    respond.
  2. verb act against or in opposition to
    oppose.
    • She reacts negatively to everything I say
  3. verb undergo a chemical reaction; react with another substance under certain conditions
    • The hydrogen and the oxygen react

WordNet

Re*act" transitive verb
Definitions
  1. To act or perform a second time; to do over again; as, to react a play; the same scenes were reacted at Rome.
Re*act" intransitive verb
Definitions
  1. To return an impulse or impression; to resist the action of another body by an opposite force; as, every body reacts on the body that impels it from its natural state.
  2. To act upon each other; to exercise a reciprocal or a reverse effect, as two or more chemical agents; to act in opposition.

Webster 1913