a maritime region in W South America: long in dispute between Chile and Peru; annexed by Chile 1883; divided as a result of arbitration 1929 into a Peruvian department (Tacna) and a Chilean department (Arica).
Tac·na (tāk'nə, täk'nä) A town of southern Peru north of Arica, Chile. The object of a long-standing dispute between Peru and Chile, it became part of Peru in 1929. Population: 280,000.