noun
plural -tions
[noncount] :actions or opinions that show that you disagree with or disapprove of someone or something
[noncount] :action that is done to stop or defeat someone or something
the opposition
a person or group that you are trying to defeat or succeed against :a person or group that you are competing with
b or the Opposition :a political party that is trying to replace the political party in power
[noncount] formal :the state or relationship of two things that are completely different from each other
in opposition to
in a way that is against someone or something
in a way that shows how two things are different or disagree