opposition/ɔpəˈzɪʃ(ə)n/
n.1. 反对；反抗opposition to his plan反对他的计划
All opposition to the government and disputes among various political parties collapsed because of the war.(喻)一打仗，对政府的所有反对意见，各政党间的分歧都烟消云散了。
There will be a lot of opposition to that plan of the tunnel across the river.对那条过江隧道的计划将来一定会有大量反对意见。
2. 反对党；在野党The opposition melted away after their leader died.反对派的领袖去世后，他们很快就散伙了。
The Opposition is / are going to vote against the government.反对党将投票反对政府。
3. （行星的）冲；（月球的）望