- an island state in the Caribbean, in the Windward Islands of the Lesser Antilles: comprises the island of St Vincent and the Northern Grenadines; formerly a British associated state (1969–79); gained full independence in 1979 as a member of the Commonwealth. Official language: English. Religion: Protestant majority. Currency: Caribbean dollar. Capital: Kingstown. Pop: 103 220 (2013 est). Area: 389 sq km (150 sq miles)