3 [2capital] a : a city serving as a seat of government b : a city preeminent in some special activity <the fashion capital> However it seems the "ol" version is correct when capitalized: Etymology: Latin Capitolium, temple of Jupiter at Rome on the Capitoline hill 1 a : a building in which a state legislative body meets b : a group of buildings in which the functions of state government are carried out 2 capitalized : the building in which the U.S. Congress meets at Washington