a country in the south-west Pacific Ocean, consisting of over 150 small islands, many of them without anyone living on them. Its former name was the Friendly Islands. It was part of the British Empire from 1900 until 1970, when it became independent and a member of the Commonwealth. It is ruled by a king or queen. Its capital city is Nuku'alofa and its official language is English. 汤加(西南太平洋的群岛国家)