department/ dɪ'pɒːtmənt /

1.noun [c] 
(in shop) 部

2.noun
(in school or college) 系

3.noun
(in government) 部

that's not my department
那不是我的专责
Department of State
 [US] 国务院
Department of Health/the Environment
 [BRIT] 卫生/环境部