- an independent republic in W Africa: member of the Commonwealth of Nations; formerly a British colony and protectorate. 27,925 sq. mi. (72,326 sq. km). Capital: Freetown.
- of or relating to Sierra Leone or its inhabitants
- a native or inhabitant of Sierra Leone
- a republic in W Africa, on the Atlantic: became a British colony in 1808 and gained independence (within the Commonwealth) in 1961; declared a republic in 1971; became a one-party state in 1978; multiparty democracy restored in 1991 but military rule was imposed following a coup in 1992, which led to civil unrest; consists of coastal swamps rising to a plateau in the east. Official language: English. Religion: Muslim majority and animist. Currency: leone. Capital: Freetown. Pop: 5 612 685 (2013 est). Area: 71 740 sq km (27 699 sq miles)
West African nation, literally "lion mountains," from Spanish sierra "mountain range" (see sierra) + leon "lion" (see lion). Attested from mid-15c. in Portuguese explorers' accounts, and a very early explanation of the name derives it from the "roaring" of thunder in the mountains. Related: Sierra Leonean.