a state of W Brazil: consists chiefly of tropical rainforest; a centre of the Amazon rubber boom until about 1912. Capital: Porto Velho. Pop: 1 431 777 (2002). Area: 243 043 sq km (93 839 sq miles)
Former name (until 1956): Guaporé
Rondônia in American English
(ʀɔ̃̃ˈdɔnjɑ)
state in W Brazil, on the Bolivian border: 92,090 sq mi (238,512 sq km); pop. 1,133,000; cap. Pôrto Velho