reaction

• Réponse, effet ou changement qui se produit en réaction à une action, un événement ou un stimulus; peut aussi désigner une réponse physiologique ou chimique, ou une attitude opposée à quelque chose.

A noun referring to a response, effect, or change that occurs as a result of an action, event, or stimulus.

1. Response to somethingA2formal

   A response or behavior that occurs as a result of a stimulus, event, or situation.

   réaction à un stimulus

   • His reaction to the news was one of shock.
   • The audience's reaction to the performance was enthusiastic.
   • She had a strong reaction to the spicy food.

   Synonymesanswerbacklashcounteractionfeedbackreboundreciprocationreflexreplyresponseretaliation

   Antonymesactioninitiativestimulus

2. Chemical reactionB2formalscientific

   A process in which substances interact to form new substances.

   Réaction chimique

   • The reaction between hydrogen and oxygen produces water.
   • The scientist observed the reaction in the test tube.
   • This chemical reaction releases a lot of heat.

   Synonymeschemical changechemical process

3. Allergic reactionB1formalmedical

   An adverse response of the body to a substance, such as a food, drug, or pollen.

   Réaction allergique

   • She had an allergic reaction to the bee sting.
   • The patient experienced a severe reaction to the medication.
   • Symptoms of an allergic reaction include itching and swelling.

   Synonymesallergyhypersensitivityhypersensitivity reaction

4. Political or social oppositionB2formal

   A political or social movement that opposes change or reform.

   Réaction (opposition politique ou sociale)

   • The new policy provoked a strong reaction from the opposition.
   • The reaction against the government's decision was immediate.
   • Conservative reaction to the proposal was predictable.

   Synonymesconservatismrightrightismtraditionalism

   Antonymeschangeliberalismprogressradicalismreform