Source : Webster's Revised Unabridged Dictionary (1913)

Capitol \Cap"i*tol\, [L. capitolium, fr. caput head: cf. F.
   capitole. See {Chief}.]
   1. The temple of Jupiter, at Rome, on the Mona Capitolinus,
      where the Senate met.

            Comes C[ae]sar to the Capitol to-morrow? --Shak.

   2. The edifice at Washington occupied by the Congress of the
      United States; also, the building in which the legislature
      of State holds its sessions; a statehouse.

Source : WordNet®

Capitol
     n 1: the federal government of the United States [syn: {Washington}]
     2: the government building in Washington where the United
        States Senate and the House of Representatives meet [syn:
        {Capitol Building}]