From a capital city to a capital letter, this word distinguishes the best and brightest. The word is derived from the Latin capitalis meaning "of the head," and between its noun and adjective forms capital has 17 senses in which it can be used. But when that last "a" becomes an "o" capitol gets much more specific. In the U.S. the Capitol is the building in Washington, D.C. used by Congress. The building was dubbed by Thomas Jefferson who derived the name from the Capitoline Hill, the seat of democracy in Ancient Rome.