The United Nations legitimized the newly formed government through a resolution.

legitimized 是动词 legitimize 的过去式，legitimize 由词根 legit（合法的）和后缀 -imize（使...化）组成，意思是"使合法化"或"正式承认"。在句中表示联合国通过决议使新政府获得合法地位。