cap·i·tol 
(kăpĭ-tl)
(kăpĭ-tl)n.
1. A building or complex of buildings in which a state legislature meets.
2. Capitol The building in Washington, DC, where the Congress of the United States meets. See Usage Note at capital1.
[Middle English Capitol, Jupiter's temple in Rome, from Old French capitole, from Latin Capitōlium, after Capitōlīnus, Capitoline, the hill on which Jupiter's temple stood; perhaps akin to caput, capit-, head; see CAPITAL1.]