imperialism/ɪmˈpɪərɪəlɪzəm; ɪm`pɪrɪəlˌɪzəm/ n[U](usu derog 通常作贬义) (belief in the) policy of extendinga country's power and influence in the world throughdiplomacy or military force, and esp by acquiring colonies帝国主义; 帝国主义政策.
牛津英汉双解词典