Department

Department can mean several things:

 Departmentalisation, the division of a larger organisation into parts with specific tasks
Academic department, a division of a school's faculty devoted to a particular subject
Ministry (government department), a division of a government with a specific responsibility
Department (country subdivision), a type of administrative division within a country
Departments of France
Departments of Argentina
Departments of Haiti
Fire department, an organisation that provides firefighting services
Police department, a body empowered by the state to enforce the law

Other uses
Department store, a retail store that has several departments dedicated to different types of products, such as clothing or household items