0 behaviour, a feeling or an action that is a direct result of something else:
There has been an immediate/widespread/hostile reaction against the government's proposed tax increases.
Reactions to the proposal so far have been adverse/favourable/mixed.
You need to have quick reactions to play these computer games.
Her left-wing views are a reaction against the conservatism of her parents.
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:
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.