1. A course of action or set of principles adopted by one party, nation, or entity without the agreement or consultation of others
The government implemented a unilateral policy on immigration reform without consulting parliament.
O governo implementou uma política unilateral sobre reforma de imigração sem consultar o parlamento.
2. In international relations, an action taken by one nation independently, without multilateral agreement
The country's unilateral policy to withdraw from the trade agreement shocked its allies.
A política unilateral do país de se retirar do acordo comercial chocou seus aliados.