1. the building in Washington, D.C., used by the Congress of the U.S. for its sessions.
2. (often lowercase) a building occupied by a state legislature.
3. the ancient temple of Jupiter at Rome, on the Capitoline.
4. the Capitoline.
Can be confused
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Origin: 1690-1700, Americanism; < Latin capitōlium temple of Jupiter on Capitoline hill, Rome, taken to be a derivative of caput head; replacing Middle English capitolie < Old North French
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