0 behaviour, a feeling or an action that is a direct result of something else: --
Her left-wing views are a reaction against the conservatism of her parents.
You need to have quick reactions to play these computer games.
Reactions to the proposal so far have been adverse/favourable/mixed.
There has been an immediate/widespread/hostile reaction against the government's proposed tax increases.
1 an unpleasant effect resulting from eating particular things or taking particular drugs: --
2 an occasion when two or more substances react with and change each other: --
a chemical reaction
3 the belief or principle that there should be no social or political change, and the attempt to stop such change from happening: --
4 behavior, a feeling, or an action that is a direct result of something else: --
5 the way that something happens, or that someone does something, as a result of something else: --
The proposal has received a generally favourable reaction.
Young people's reactions to world events are often at variance with those of their parents.
The committee kept the results of the survey to itself, fearing a bad public reaction.
The protests are a delayed reaction to last week's announcement.