an island in the S Pacific: forms with the islands of Ducie, Henderson and Oeno (all uninhabited) a UK Overseas Territory; Pitcairn itself was uninhabited until the landing in 1790 of the mutineers of H.M.S. Bounty and their Tahitian companions. Capital: Adamstown. Pop: 48 (2012 est). Area: 4.6 sq km (1.75 sq miles)