re‧ac‧tion S2 W2
something that you feel or do because of something that has happened or been said [↪ response]:
to a situation/event[uncountable and countable]
What was Jeff's reaction when you told him about the job?
the government's reaction to the fuel crisis
bring/provoke/produce a reaction
The news brought an angry reaction from unions.
somebody's first/immediate reaction
His first reaction was to deny everything.
instinctive/gut reaction (=what you immediately feel before you have time to think)
My gut reaction was not to trust him.
There were mixed reactions (=different people reacting in different ways) to the strike.
in reaction to something
An emergency fund was set up in reaction to the famine.
your ability to move quickly when something dangerous happens suddenly:
a skilled driver with very quick reactions
if you have a reaction to a drug or to something you have eaten, it makes you ill
a reaction to the immunization
science[uncountable and countable]
a chemical change that happens when two or more substances are mixed together:
a chemical reaction in the soil
a physical force that is the result of an equally strong physical force in the opposite direction
a change in people's attitudes, behaviour, fashions etc that happens because they disapprove of the way in which things were done in the past
a reaction against the traditional values of the nineteenth century
strong and unreasonable opposition to all social and political changes:
against change[uncountable] formalPPP
The revolutionary movement was crushed by the forces of reaction.