the process or fact of deciding a policy or action without involving another group or country

He has made the world more dangerous by his arrogant unilateralism. 他傲慢的单边主义使世界变得更加危险。

Our position in the world has been weakened by too much unilateralism and too little cooperation. 单边主义太多，合作太少，削弱了我们在世界上的地位。

a policy of getting rid of your country's nuclear weapons without first waiting for other countries to do the same

the party's switch from unilateralism to a policy of nuclear deterrence 该党的政策从单方面销毁核武器转变为奉行核威慑。