Leon UK /ˈliː.ɒn/US /ˈli.ɑn/ noun6 •A city in northwestern Spain, the former capital of the Kingdom of Leon. •A province of Castile and León, Spain around the city. •A historical region of Spain around the province. •(historical) A former polity in the Iberian Peninsula, a kingdom with the city as its capital. •A department of Nicaragua. •A cultural region of the department of Finistère, Brittany, France, around the former polity.