Capitolium
nounEtymology From Latin Capitōlium (“Capitoline Hill, its temples; similar citadels”), from the oblique stem of caput (“head”) + -ō (noun-forming suffix) or -ōlus (“-ole”, diminutive suffix) + -ium (suffix forming place names). Doublet of capitol and capitoul.
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Historical, Uncommon Synonym of capitol, similar citadels in ancient Italian and Roman towns.