*cit·i·zen/`sɪtəzṇ; ˈsɪtɪzən/ n [C] 1 someone who lives in a particular town, state, or country 市民，城镇居民: the citizens of Moscow 莫斯科市民 2 someone who legally belongs to a particular country, whether they live there or not 公民，国民: The US government was advising all American citizens to leave Liberia. 美国政府正建议所有美国公民离开利比里亚。