noun 1.a river in W Africa, flowing W to the Atlantic. 500 miles (800 km) long.
2.a republic extending inland along both sides of this river: formerly a British crown
colony and protectorate; gained independence 1965; member of the Commonwealth of Nations. 4003 sq. mi. (10,368 sq. km).
Capital: Banjul.
Related forms Gam·bi·an, adjective, noun