The Collaborative International Dictionary of English v.0.48:

Brasilia \Brasilia\ prop. n. (Geography)
   The capital city of Brazil, built on the central plateau.
   Population (2000) = 1,800,000.

   Syn: Brazilian capital.
        [WordNet 1.5] brasilin

WordNet (r) 3.0 (2006):

Brasilia
    n 1: the capital of Brazil; a city built on the central plateau
         and inaugurated in 1960 [syn: Brasilia, Brazilian
         capital, capital of Brazil]