citadel
/ˈsɪtədəl/noun
1
- a fortress, typically on high ground protecting or dominating a city（尤指建于高地保卫、俯视城市的）堡垒, 要塞。
2
- a meeting hall of the Salvation Army救世军会议厅。
词源
mid 16th cent.: from French citadelle, or from Italian cittadella, based on Latin civitas 'city' （see CITY）.