Capitol/ˈkæpɪtl/ Definition 1 of 2Pro Tip 1/3Landmark Status Capitols are often historical landmarks and symbols of governmental authority. The group toured the capitol, admiring its historical significance. Pro Tip 2/3Not Capital Don't confuse 'capitol' with 'capital'; 'capitol' is a building, while 'capital' refers to a city. The capitol building stands in the state capital. Pro Tip 3/3Proper Noun When referring to a specific capitol building, capitalize 'Capitol'. We visited the Capitol yesterday.